Feliciano v. Department Of Transportation

Summary

A federal civilian employee called to active duty pursuant to “any other provision of law . . . during a national emergency” as described in 10 U. S. C. §101(a)(13)(B) is entitled to differential pay if the reservist’s service temporally coincides with a declared national emergency without any showing that the service bears a substantive connection to a particular emergency.

Text

PRELIMINARY PRINT 
Volume 605 U. S. Part 1 
Pages 38–72 
OFFICIAL REPORTS 
OF 
THE SUPREME COURT 
April 30, 2025 
REBECCA A. WOMELDORF 
reporter of decisions 
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[email protected], of any typographical or other formal errors.

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38 OCTOBER TERM, 2024 
Syllabus 
FELICIANO v. DEPARTMENT OF TRANSPORTATION 
certiorari to the united states court of appeals for 
the federal circuit 
No. 23–861. Argued December 9, 2024—Decided April 30, 2025 
Tens of thousands of federal civilian employees serve the Nation as mili-
tary reservists. When called to active duty, these reservists often re-
ceive less pay than they earn in their civilian jobs. To address this gap, 
Congress adopted a “differential pay” statute requiring the government 
to make up the difference between a federal civilian employee's military 
and civilian pay in various circumstances, including when the reservist 
is called to active duty “during a national emergency.” At issue here 
is whether this language guarantees differential pay when a reservist 
serves on active duty while a national emergency is ongoing, or whether 
it requires proving a “substantive connection” between the service and 
a particular national emergency. 
Petitioner Nick Feliciano, an air traffc controller with the Federal 
Aviation Administration, also served as a Coast Guard reserve petty 
offcer. In July 2012, the Coast Guard ordered him to active duty under 
10 U. S. C. § 12301(d), which authorizes activation of reservists with 
their consent. He remained on active duty until February 2017, serv-
ing aboard a Coast Guard ship escorting vessels to and from harbor. 
His orders noted that he was called to active duty “in support of” sev-
eral “contingency operation[s],” including Operations Iraqi Freedom and 
Enduring Freedom. Throughout this period, Feliciano did not receive 
differential pay for his service pursuant to orders under § 12301(d). 
After the Merit Systems Protection Board rejected his differential-pay 
claim, he appealed to the Federal Circuit. 
Feliciano argued that two statutes entitled him to differential pay: 5 
U. S. C. § 5538(a) and 10 U. S. C. § 101(a)(13)(B). Section 5538(a) re-
quires differential pay for federal civilian employee reservists ordered 
to active duty “under . . . a provision of law referred to in” 
§ 101(a)(13)(B). Section 101(a)(13)(B) defnes “contingency operation” to 
include operations that result in the call to active duty of servicemem-
bers under several enumerated statutes “or any other provision of law 
during a war or during a national emergency declared by the President or 
Congress.” While acknowledging he was not called up under any of the 
specifcally listed statutes, Feliciano contended that the fnal phrase enti-
tled him to differential pay because he was ordered to active duty under 
“any other provision of law” (§ 12301(d)) “during a national emergency.”

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Cite as: 605 U. S. 38 (2025) 39 
Syllabus 
The Federal Circuit disagreed. Following its earlier decision in 
Adams v. Department of Homeland Security , 3 F. 4th 1375, the court 
held that when a reservist seeks differential pay for service “during a 
national emergency,” he must show not only that he served while a 
national emergency was ongoing, but also that a substantive connection 
linked his service to a particular national emergency. 
Held: A federal civilian employee called to active duty pursuant to “any 
other provision of law . . . during a national emergency” as described in 
§ 101(a)(13)(B) is entitled to differential pay if the reservist's service 
temporally coincides with a declared national emergency without any 
showing that the service bears a substantive connection to a particular 
emergency. Pp. 44–56. 
(a) Several considerations support this interpretation. First, the 
word “during” normally “denotes a temporal link” and means “contem-
poraneous with.” United States v. Ressam, 553 U. S. 272, 274–275. It 
does not generally imply any substantive connection. Absent evidence 
that Congress intended a specialized meaning, those governed by law 
are entitled to rely on its ordinary meaning. Pp. 44–46. 
(b) Contextual clues strengthen this conclusion. When Congress in-
tends to require both temporal and substantive connections, it has done 
so expressly, using phrases like “during and in relation to” or “during 
and because of” in various statutes. So the absence of any words hint-
ing at a substantive connection in the statute at issue here supplies a 
telling clue that it operates differently and imposes a temporal condition 
alone. See Ysleta del Sur Pueblo v. Texas, 596 U. S. 685, 704. Addi-
tionally, one of the specifc provisions that can trigger differential pay, 10 
U. S. C. § 12302, authorizes activation of reservists “[i]n time of national 
emergency”—language the government contends speaks only tempo-
rally. If that phrase requires no substantive connection, it is implausi-
ble that “during a national emergency” in § 101(a)(13)(B) would do so. 
Moreover, requiring a substantive connection would create interpretive 
diffculties, as the statute provides no principled way to determine what 
kind of substantive connection would suffce. The government's inter-
pretation would also create tension with 18 U. S. C. § 209, potentially 
criminalizing differential pay given by private employers to reservists, 
even though nothing in the phrase “during a national emergency” tells 
a private employer that a substantive connection is required, let alone 
what sort of connection must exist. Finally, when the Congressional 
Budget Offce scored similar legislation to help Congress understand the 
likely impact of proposed legislation, it calculated costs based on “the 
total number of reservists on active duty,” not just those engaged in 
emergency-related duties. CBO's approach provides further evidence

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40 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Syllabus 
of how an ordinary reader might have understood the statutory lan-
guage at issue here. Pp. 46–48. 
(c) The government's counterarguments are unpersuasive. First, al-
though the word “during” can sometimes imply more than a temporal 
connection depending on context, in this statutory context a purely tem-
poral relationship is meaningful. A reservist's active-duty service dur-
ing a national emergency bolsters the government's capacity to address 
that emergency whether or not his service directly relates to it. Sec-
ond, the government's surplusage argument—that a temporal-only read-
ing would render the phrase meaningless given the perpetual existence 
of national emergencies—fails for several reasons: The interpretation 
leaves no part of the statute without work to do; the argument depends 
on contingent factual assumptions about the permanence of emergency 
declarations; similar statutes use temporal language without requiring 
substantive connections; and the statute provides no principled way to 
determine what kind of substantive connection would suffce. Finally, 
the potential policy consequences the government highlights cannot 
overcome the statute's most natural reading. Pp. 49–56. 
Reversed and remanded. 
Gorsuch, J., delivered the opinion of the Court, in which Roberts, C. 
J., and Sotomayor, Kavanaugh, and Barrett, JJ., joined. Thomas, J., 
fled a dissenting opinion, in which Alito, Kagan, and Jackson, JJ., 
joined, post, p. 56. 
Andrew T. Tutt argued the cause for petitioner. With him 
on the briefs were John P . Elwood, Daniel Yablon, Matthew 
L. Farley, and Brian J. Lawler . 
Nicole Frazer Reaves argued the cause for respondent. 
With her on the brief were Solicitor General Prelogar, Prin-
cipal Deputy Assistant Attorney General Boynton, Deputy 
Solicitor General Fletcher , and Geoffrey M. Long .* 
*Briefs of amici curiae urging reversal were fled for the State of Texas 
et al. by Ken Paxton, Attorney General of Texas, Brent Webster, First 
Assistant Attorney General, Aaron L. Nielson, Solicitor General, Kyle D. 
Highful, Assistant Solicitor General, and J. Andrew Mackenzie, Assistant 
Attorney General, by Alan Wilson, Attorney General of South Carolina, 
Robert D. Cook, Solicitor General, J. Emory Smith, Jr., Deputy Solicitor 
General, and Thomas T. Hydrick and Joseph D. Spate , Assistant Deputy 
Solicitors General, and by the Attorneys General for their respective juris-
dictions as follows: Kris Mayes of Arizona, Tim Griffn of Arkansas,

Cite as: 605 U. S. 38 (2025) 41 
Opinion of the Court 
Justice Gorsuch delivered the opinion of the Court. 
Tens of thousands of federal civilian employees serve 
the Nation as military reservists. When the military calls 
those reservists to active duty, it often pays them less 
than they earn in their civilian jobs. Seeking to address 
that gap, Congress some years ago adopted a “differential 
pay” statute. That law requires the government to make 
up the difference between a federal civilian employee's mili-
tary and civilian pay in various circumstances, including 
when he is called to active duty “during a national emer-
gency.” The question we face concerns the meaning of that 
quoted language. Does it guarantee a reservist differen-
tial pay when he serves on active duty while a national emer-
gency is ongoing, or does it require a reservist to prove 
that his service bears a “substantive connection” to a par-
ticular national emergency? 
I 
Nick Feliciano began working for the Federal Aviation Ad-
ministration as an air traffc controller in 2005. App. to Pet. 
for Cert. 9a. At the same time, Mr. Feliciano served as a 
reserve petty offcer in the United States Coast Guard. 
Ibid.; Brief for Respondent 6. In July 2012, the Coast 
Philip J. Weiser of Colorado, William Tong of Connecticut, Brian L. 
Schwalb of the District of Columbia, Ashley Moody of Florida, Kwame 
Raoul of Illinois, Brenna Bird of Iowa, Russell Coleman of Kentucky, 
Anthony G. Brown of Maryland, Keith Ellison of Minnesota, Lynn Fitch 
of Mississippi, Michael T. Hilgers of Nebraska, Dave Yost of Ohio, Ellen 
F. Rosenblum of Oregon, Michelle A. Henry of Pennsylvania, Jonathan 
Skrmetti of Tennessee, Jason S. Miyares of Virginia, Patrick Morrisey of 
West Virginia, and Josh Kaul of Wisconsin; for the American Federation 
of Government Employees by Matthew W. Milledge , David A. Borer , and 
Andres M. Grajales; for Members of Congress by Timothy Taylor and 
Sarah Kelly-Kilgore; for Military-Veterans Advocacy, Inc., by Melanie L. 
Bostwick and John B. Wells; for the National Law School Veterans Clinic 
Consortium by Katie M. Becker and Brent G. Filbert; and for the Reserve 
Organization of America by Scott A. Felder . 
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42 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Opinion of the Court 
Guard ordered him to active-duty service and, for the most 
part, he remained on active duty until February 2017. App. 
to Pet. for Cert. 14a. 
During much of that period, the statutory authority for 
Mr. Feliciano's active-duty service came from 10 U. S. C. 
§ 12301(d). As a general matter, that provision authorizes 
the activation of reservists with their consent. Mr. Feli-
ciano's § 12301(d) orders noted that he was called to active 
duty to serve “in support of” several “contingency opera-
tion[s],” including Operation Iraqi Freedom and Operation 
Enduring Freedom. App. to Pet. for Cert. 33a, 75a–76a; 
Brief for Respondent 7. Throughout his active-duty serv-
ice, Mr. Feliciano served onboard a Coast Guard ship escort-
ing other vessels to and from harbor. Brief for Petitioner 8; 
Brief for Respondent 6. 
While Mr. Feliciano served on active duty pursuant to or-
ders under § 12301(d), the government did not afford him dif-
ferential pay. App. to Pet. for Cert. 31a, 34a–37a. Eventu-
ally, that led Mr. Feliciano to seek relief from the Merit 
Systems Protection Board. Id., at 8a, 34a–37a. There, he 
claimed the FAA had created a hostile work environment 
and unlawfully denied him differential pay during the time 
he spent serving on active duty under § 12301(d). After the 
Board rejected his claims, see id., at 29a–30a, 37a, Mr. Felici-
ano appealed to the Federal Circuit. 
On appeal, Mr. Feliciano argued that two statutes entitled 
him to differential pay: 5 U. S. C. § 5538(a) and 10 U. S. C. 
§ 101(a)(13)(B). See Brief for Petitioner in No. 2022–1219 
(CA Fed., Apr. 29, 2022), ECF Doc. 21, p. 19. As relevant 
here, § 5538(a) requires the government to provide differen-
tial pay to a federal civilian employee reservist when the 
military orders him to active-duty service “under . . . a provi-
sion of law referred to in section 101(a)(13)(B) of title 10” of 
the U. S. Code. Section 101(a)(13)(B), in turn, forms part 
of the defnition of the phrase “contingency operation.” A 
contingency operation, that statute says, includes a “military

Cite as: 605 U. S. 38 (2025) 43 
Opinion of the Court 
operation that . . . results in the call or order to . . . active 
duty of members of the uniformed services under section 
688, 12301(a), 12302, 12304, 12304a, 12305, or 12406 of [title 
10], chapter 13 of [title 10], section 3713 of title 14, or any 
other provision of law during a war or during a national 
emergency declared by the President or Congress.” (Em-
phasis added.) 
1 
Though Mr. Feliciano acknowledged that he was not called 
up under any of the specifc statutes listed in § 101(a)(13)(B), 
he argued that the statute's closing words, italicized above, 
entitled him to differential pay. After all, the Coast Guard 
called him to active duty under another “provision of law” 
(§ 12301(d)), and his orders came “during a national emer-
gency.” ECF Doc. 21, at 21–23. As a result, he contended, 
he served pursuant to a call to active duty under “a provi-
sion of law referred to in 10 U. S. C. § 101(a)(13)(B),” and 
was thus entitled to differential pay under § 5538(a). Id., 
at 19, 23. 
The Federal Circuit disagreed. Citing its earlier decision 
in Adams v. Department of Homeland Security , 3 F. 4th 
1375 (2021), the court reasoned that, when a reservist seeks 
differential pay for service “during a national emergency,” 
he must show not only that he served on active duty while 
a national emergency was ongoing. He must also show a 
substantive connection between his service and a particular 
national emergency. App. to Pet. for Cert. 4a. Because 
Mr. Feliciano had not made that second showing, the court 
held, he was not entitled to differential pay. Id., at 3a–4a. 
1 Section 101(a)(13)(A) forms the other part of the defnition of the 
phrase “contingency operation.” It provides that “contingency opera-
tion” also includes “a military operation that . . . is designated by the 
Secretary of Defense as an operation in which members of the armed 
forces are or may become involved in military actions, operations, or hos-
tilities against an enemy of the United States or against an opposing mili-
tary force.” Notably, however, 5 U. S. C. § 5538(a) does not reference this 
provision for purposes of determining when differential pay is due. 
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44 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Opinion of the Court 
Mr. Feliciano sought review of the Federal Circuit's deci-
sion, and we agreed to take his case. 602 U. S. 1037 (2024). 
II 
At its core, the dispute before us turns on the meaning of 
the phrase “during a national emergency.” Does that lan-
guage promise differential pay to certain federal civilian em-
ployees called to active-duty service while a national emer-
gency is ongoing, as Mr. Feliciano argues? Or does it 
require a reservist to prove some additional, substantive 
connection between his service and a particular national 
emergency, as the Federal Circuit held and the government 
contends? Several considerations persuade us that Mr. 
Feliciano's interpretation is the sounder one. 
A 
Start with the word “during.” Normally, we have said, 
that word “denotes a temporal link” and means “contempora-
neous with.” United States v. Ressam, 553 U. S. 272, 274– 
275 (2008). Any number of dictionaries from around the 
time of § 101(a)(13)(B)'s adoption in 1991 offer up similar for-
mulations. See, e. g., Black's Law Dictionary 504 (6th ed. 
1990) (defning “during” as “[t]hroughout the course of; 
throughout the continuance of; in the time of; after the com-
mencement and before the expiration of”).
2 
Conversely, the word “during” does not generally imply a 
substantive connection. The government itself has pre-
2 Accord, Random House Dictionary of the English Language 608 (2d ed. 
1987) (during: “throughout the duration, continuance, or existence of” or 
“at some time or point in the course of”); Webster's Third New Interna-
tional Dictionary 703 (1993) (during: “throughout the continuance or 
course of” or “at some point in the course of”); American Heritage Diction-
ary 572 (3d ed. 1992) (during: “[t]hroughout the course or duration of” 
or “[a]t some time in”). Dictionaries from the time of § 5538's enactment 
in 2009 say the same. See, e. g., American Heritage Dictionary 556 (4th 
ed. 2006) (during: “[t]hroughout the course or duration of” or “[a]t some 
time in”). 
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viously acknowledged as much. As its briefng in Ressam 
explained, “[t]he plain everyday meaning of `during' is `at 
the same time' or `at a point in the course of.' It does not 
normally mean `at the same time and in connection with.' ” 
Brief for United States in United States v. Ressam, O. T. 
2007, No. 455, pp. 13–14 (emphasis added). Reading “dur-
ing” to require a substantive connection, the government 
warned, risks “read[ing] in a relational element” that the 
word does not necessarily convey. Tr. of Oral Arg. in 
United States v. Ressam, O. T. 2007, No. 455, p. 31. Adopt-
ing just that view, this Court in Ressam held that a sentenc-
ing enhancement addressing those who carry an explosive 
“during” the commission of a felony applies to individuals 
who carry explosives “contemporaneous with” their felonies 
even in the absence of a substantive “relationship between 
the explosive carried and the underlying felony.” 553 U. S., 
at 275. 
Sometimes, to be sure, statutory terms can carry meanings 
that depart from their ordinary ones. Congress may, for ex-
ample, defne a word or phrase in a specialized way or em-
ploy a term of art with long-encrusted connotations in a 
given feld. See, e. g., Department of Agriculture Rural De-
velopment Rural Housing Service v. Kirtz, 601 U. S. 42, 59– 
60 (2024); Sekhar v. United States, 570 U. S. 729, 733 (2013). 
But we have no evidence of anything like that here. And 
absent such evidence, those whose lives are governed by law 
are entitled to rely on its ordinary meaning, not left to specu-
late about hidden messages. See, e. g., Henson v. Santander 
Consumer USA Inc., 582 U. S. 79, 86 (2017); Niz-Chavez v. 
Garland, 593 U. S. 155, 163 (2021). 
Given all that, we think Mr. Feliciano's reading more con-
sistent with the statutory language before us. Just ask 
yourself how an ordinary American might approach the law's 
terms. Would he have any reason to think that a reservist 
called up to active duty “during” a national emergency is 
entitled to differential pay if, and only if, he can prove his

46 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Opinion of the Court 
service has a “substantive connection” to a particular emer-
gency? We doubt it. 
B 
Strengthening our conviction on this score are a number 
of contextual clues. 
First, compare the statute before us with other laws. 
When insisting on both a temporal and a substantive connec-
tion in other settings, Congress has commonly made its point 
expressly. Up and down the federal criminal code, for in-
stance, statutes speak of actions taken “during and in rela-
tion to” specifed criminal conduct. 18 U. S. C. § 924(c)(1)(A) 
(emphasis added); see also, e. g. , §§ 115(b)(1)(B)(iv), 
924(c)(5), 929(a)(1). When it comes to statutes governing 
the Armed Forces, Congress has used the phrase “during 
and because of ” to describe leave both contemporaneous 
with and related to a reservist's active-duty service. 5 
U. S. C. § 6323(b)(2)(B) (emphasis added). Congress, too, has 
exempted from certain statutory requirements the govern-
ment's acquisition of land when it takes place both “during 
a national emergency” and “ for national defense purposes.” 
7 U. S. C. § 4208(b) (emphasis added). As these examples il-
lustrate, Congress can and does use different words in differ-
ent provisions to insist on a substantive connection. But the 
absence of any words hinting at a substantive connection in 
the statute before us supplies a telling clue that it operates 
differently and imposes a temporal condition alone. See Ys-
leta del Sur Pueblo v. Texas, 596 U. S. 685, 704 (2022). 
Next, consider another provision that can trigger differen-
tial pay. Recall that the differential-pay statute—5 U. S. C. 
§ 5538—not only works in concert with § 101(a)(13)(B) to en-
sure differential pay for certain reservists ordered to active 
duty “during a national emergency.” It also guarantees dif-
ferential pay for other reservists called up under specifc 
statutes listed in § 101(a)(13)(B). See Part I, supra. One 
such statute, 10 U. S. C. § 12302, authorizes the activation of 
various reservists “[i]n time of national emergency.” The 
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Opinion of the Court 
government contends that this language speaks only tempo-
rally. See Tr. of Oral Arg. 61–62. But if that is true and 
the phrase “[i]n time of a national emergency” in § 12302 re-
quires no substantive connection, how might “during a na-
tional emergency” in § 101(a)(13)(B) do so? If a plausible ex-
planation exists for interpreting the one phrase, but not the 
other, to require a substantive connection, the government 
does not supply it. 
Notice, as well, the questions that would follow from insist-
ing on a substantive connection here. To prove a substan-
tive connection, the government suggests, a reservist must 
show that he served in support of a contingency operation 
while on active duty. Brief for Respondent 23–24; Tr. of 
Oral Arg. 75–76; post, at 71 (Thomas, J., dissenting) (arguing 
the same). But the Federal Circuit applies a more demand-
ing test. On its view, a reservist must show that he served 
directly in a contingency operation to merit differential pay. 
See App. to Pet. for Cert. 4a; Adams, 3 F. 4th, at 1379. How 
might we choose between these two rules? The statute 
does not say. And the fact that Congress supplied no princi-
pled way to determine what kind of substantive connection 
is necessary strikes us as yet another sign that the law does 
not require any such connection. 
Also relevant, to our minds, is how the parties' competing 
interpretations interact with 18 U. S. C. § 209. As a rule, 
that law makes it a crime for a private party to supplement 
a federal employee's salary. See § 209(a). At the same 
time, the statute offers an important exception: It allows 
a private party to offer differential pay to a reservist-
employee “on active duty pursuant to a call or order to active 
duty under a provision of law referred to” in 10 U. S. C. 
§ 101(a)(13). 18 U. S. C. § 209(h). On the government's 
reading of § 101(a)(13)(B), a private employer would appar-
ently commit a federal crime by providing differential pay to 
a reservist on active-duty service while a national emer-
gency is ongoing—unless, of course, the reservist's service

48 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Opinion of the Court 
bears a substantive connection to a particular national emer-
gency. But what in the phrase “during a national emer-
gency” tells a private employer that a substantive connection 
is required, let alone what sort of connection it must be? 
3 
Finally, adding to the case against the government's inter-
pretation are the views of others who have come this way 
before us. The Congressional Budget Offce (CBO) provides 
cost estimates to help Members of Congress understand the 
likely impact of their proposed legislation. See, e. g., Con-
gressional Research Service, J. Saturno, Introduction to the 
Federal Budget Process 19 (Jan. 10, 2023). And when CBO 
scored potential legislation featuring terms that largely mir-
ror those now at issue here, it based its calculations on “ the 
total number of reservists on active duty,” not those who 
are personally engaged in emergency-related duties. CBO, 
Cost Estimate, S. 593: Reservist Pay Security Act of 2004, 
pp. 2–3 (Aug. 4, 2004) (emphasis added); see also CBO, Cost 
Estimate, S. 2400: Ronald W. Reagan National Defense Au-
thorization Act for Fiscal Year 2005, p. 9 (July 21, 2004). Of 
course, no one votes for CBO reports, and courts charged 
with interpreting the law owe those estimates no rote defer-
ence. But CBO's approach does provide further evidence of 
how an ordinary reader might have understood the statutory 
language at issue here around the time of the differential-
pay statute's adoption. See A. Scalia & B. Garner, Reading 
Law: The Interpretation of Legal Texts 388 (2012) 
(Scalia & Garner). 
3 At oral argument, the government suggested that an employer who 
mistakenly provides differential pay to a reservist without confrming that 
his service has the requisite substantive connection to a particular emer-
gency might escape liability for lack of a suffcient mens rea to warrant a 
conviction. See Tr. of Oral Arg. 45–46; see also United States v. Project 
on Government Oversight, 616 F. 3d 544, 556–557 (CADC 2010). Maybe 
so. But that still leaves unanswered the question whether the statute 
fairly informs an employer what is (and is not) proscribed. 
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Opinion of the Court 
III 
The government and our dissenting colleagues see things 
differently. They insist that the phrase “during a national 
emergency” requires a substantive connection between a re-
servist's service and a particular national emergency. To 
our minds, however, the government and the dissent do not 
adequately grapple with the textual and contextual evidence 
we have set forth. They give short shrift to Ressam and 
the ordinary meaning of the word “during.” They brush 
aside other statutes showing that Congress knows how to 
impose a substantive connection when it wishes. They do 
not convincingly explain how § 12302 might be read to re-
quire only a temporal connection but “during a national 
emergency” must be read to demand more. They discount 
CBO's practice. And they nowhere offer a principled basis 
for preferring the substantive connection they propose over 
the alternative the Federal Circuit offered. 
To be sure, the three central arguments the government 
and the dissent pursue are not entirely without force. But 
even on their own terms, each suffers defciencies and, to our 
eyes, none suffces to overcome the competing evidence of 
statutory meaning we have outlined. 
A 
The government and the dissent begin by observing that, 
in at least some contexts, the word “during” can imply more 
than a temporal connection. Brief for Respondent 14–17; 
see post, at 59–60 (opinion of Thomas, J.). To illustrate the 
point, the government asks us to imagine a statute that “re-
ferred to any attorney who argues `during' a court hearing.” 
Brief for Respondent 14. A reader would, the government 
posits, understand that language “to include only attorneys 
who argue in the course of the hearing—not those who argue 
elsewhere while the hearing happens to be occurring.” 
Ibid. 
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50 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Opinion of the Court 
It's a fair observation. Context plays a vital role when 
interpreting statutes. And, in the context of the govern-
ment's hypothetical law, we agree that an ordinary reader 
would understand it to require both a temporal and substan-
tive connection between an attorney's argument and the 
court hearing. Really, without a substantive connection, the 
government's imagined statute would be meaningless, cap-
turing any attorney who happens to argue anywhere in any 
forum at the same time as the ongoing hearing. The same 
goes for the dissent's example of a statute defning a “ `cap-
tured record' ” to mean “ `material captured during combat 
operations.' ” Post, at 60 (opinion of Thomas, J.) (quoting 10 
U. S. C. § 427(g)(1)). There, too, an ordinary reader would 
understand Congress as referring only to records captured 
in the course of combat operations, not to all records cap-
tured while combat was ongoing somewhere, for without that 
substantive connection the statute would be senseless. 
But we fail to see how that observation translates here. 
In this statutory context, a purely temporal relationship is 
meaningful. After all, a reservist's active-duty service dur-
ing a national emergency bolsters the government's capacity 
to address that emergency; his work on everyday matters 
may free up others to handle emergent ones. Notably, the 
government itself argues that Congress has sometimes taken 
just this view, promising differential pay to certain reserv-
ists called to active duty “in time of national emergency,” 
whether or not their service bears a substantive connection 
to a particular emergency. See Part II–B, supra (discussing 
10 U. S. C. § 12302). In this context, then, unlike in some 
others, reading the word “during” to speak only temporally 
is perfectly sensible.
4 
4 Pursuing a similar argument from statutory context, the dissent sub-
mits that, because the phrase “contingency operation” implies some “exi-
genc[y]” as a matter of “ordinary” usage, the word “during” must entail a 
substantive connection. See post, at 61–63 (opinion of Thomas, J.). But 
none of that follows. The phrase “contingency operation” is subject to an 
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B 
Next, the government and the dissent invoke the surplus-
age canon. If the phrase “during a national emergency” re-
quired only a temporal overlap, the government and the dis-
sent say, it would do practically no work. After all, the 
argument goes, there are dozens of declared emergencies 
today, some have been on the books for years, and it is “un-
likely that there will ever be a time when no national emer-
gency exists.” Brief for Respondent 18–19; post, at 63–67 
(opinion of Thomas, J.). The only way to give the phrase 
“during a national emergency” work to do, we are told, is to 
interpret it to require a substantive connection. 
Here, again, the government and the dissent have some-
thing of a point. With the exception of a brief period in the 
1970s, one declared national emergency or another has been 
ongoing in this country for many decades. Brief for Re-
spondent 18; post, at 63 (Thomas, J., dissenting). Even so, 
this line of argument does not persuade us for a few reasons 
taken in combination. 
For one thing, the surplusage canon is primarily a tool of 
linguistic interpretation, refecting an assumption applicable 
to “all sensible writing: Whenever a reading arbitrarily ig-
express statutory defnition, to which we must adhere “even if it varies 
from a term's ordinary meaning.” Digital Realty Trust, Inc. v. Somers, 
583 U. S. 149, 160 (2018). That defnition includes a military operation 
that results in a call to active duty under certain specifcally enumerated 
statutory authorities or under any other law “during a national emer-
gency.” As even the dissent admits, some of the specifcally enumerated 
statutory authorities are “not pegged to [a] specifc exigenc[y].” Post, at 
62 (opinion of Thomas, J.). By way of example, consider again 10 U. S. C. 
§ 12302, which the government says allows it to call reservists to active 
duty “[i]n time of national emergency” regardless whether their service 
bears a substantive connection to any particular emergency. And if the 
specifcally enumerated statutory authorities that help defne a “contin-
gency operation” do not always demand a substantive connection between 
a reservist's service and a particular emergency, we see no reason why 
the phrase “during a national emergency” must. 
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52 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Opinion of the Court 
nores linguistic components or inadequately accounts for 
them, the reading may be presumed improbable.” Scalia & 
Garner 174 (internal quotation marks omitted). Nothing in 
our interpretation of § 101(a)(13)(B) defes that general rule 
of construction. When a reservist is called to active duty 
under one of the statutes enumerated in § 101(a)(13)(B), 
§ 5538(a) guarantees him differential pay. And when a re-
servist is called to active duty under “any other provision 
of law,” he is entitled to differential pay only if a na -
tional emergency (or war) is ongoing. See 10 U. S. C. 
§ 101(a)(13)(B); 5 U. S. C. § 5538(a). Linguistically, our read-
ing leaves no part of the statute ignored or left without work 
to do. 
For another, the government and dissent's practical (not 
linguistic) superfuity argument depends on a contingent fac-
tual assumption. Imagine Congress and the President de-
cided tomorrow to end all existing emergencies. No one 
disputes that our reading of the statute would perform 
practically signifcant work in those circumstances, effec-
tively denying differential pay to reservists called to active 
duty under “any other provision of law.” 10 U. S. C. 
§ 101(a)(13)(B). But, the government and the dissent insist, 
we should ignore that possibility because emergencies have 
become an immutable feature of modern governance. See 
Tr. of Oral Arg. 43; post, at 63 (opinion of Thomas, J.). 
Maybe so, but maybe not. In the 1970s, the elected 
branches did something nearly like what the government 
today considers unthinkable. In 1976, Congress passed and 
President Ford signed the National Emergencies Act, which 
effectively ended then-existing emergencies and established 
procedures for declaring (and concluding) new ones. See 90 
Stat. 1255 (codifed at 50 U. S. C. § 1601 et seq .); Congres-
sional Research Service, E. Webster, National Emergency 
Powers 7–11 (Nov. 19, 2021). In spite of that intervention, 
of course, the number of declared emergencies has only 
grown in the years since. But history may yet repeat itself, 
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Opinion of the Court 
even if the government today considers the prospect “un-
likely.” Brief for Respondent 19. And it is unclear why we 
should overlook the most natural linguistic interpretation of 
this statute's terms based on an assumption that prevailing 
factual conditions will never change. What is a present fact 
of the world is not necessarily a permanent one. 
For another thing still, the government and dissent's ap-
proach invites its own superfuity problems. A number of 
statutes tie a governmental power or duty to the existence 
of some ongoing national emergency. For example, Con-
gress has made certain contracting authorities available to 
the Executive Branch “during a national emergency.” 50 
U. S. C. § 1435. And, as we have seen, Congress has prom-
ised differential pay to certain other reservists called to ac-
tive duty “[i]n time of national emergency.” See Part II–B, 
supra. The government maintains that these statutes do 
not require a substantive connection, only a temporal over-
lap, with a national emergency. See Brief for Respondent 
30; Tr. of Oral Arg. 61–62. Yet, under the government and 
dissent's view, Congress was wasting its breath with super-
fuous language in all these laws. A more natural inference, 
we believe, is that Congress sometimes considers a purely 
temporal link with a national emergency a salient condition 
on governmental powers and duties, even if that condition 
will often be satisfed. 
Finally, even if we could somehow overcome all of these 
problems, we would only fnd ourselves facing again the 
question of what kind of substantive tie a reservist's service 
must have to a national emergency. And, as we have dis-
cussed, the statute supplies no obviously principled way for 
us to resolve what that connection might be. See Part II– 
B, supra.
5 
5 The dissent also insists that our reading would render superfuous vari-
ous postenactment amendments that have expanded the list of provisions 
enumerated in § 101(a)(13)(B). Post, at 65–67 (opinion of Thomas, J .). 
That argument is mistaken for reasons already discussed: Each of the

54 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Opinion of the Court 
C 
Failing all else, the government and the dissent worry that 
our interpretation would invite anomalous policy conse-
quences. Brief for Respondent 22; post, at 68 (opinion of 
Thomas, J.) (expressing concern about the potential “rip-
ple effects” of our decision). So, for example, the govern-
ment fears that a purely temporal reading of the phrase 
“during a national emergency” might require it to provide 
differential pay to a reservist called to active duty to face 
a court-martial. Brief for Respondent 22–23. Likewise, 
the government says, our reading could require differen-
tial pay for a reservist called up to attend “training for 
new Judge Advocates at the Judge Advocate General's 
Legal Center and School in Charlottesville, Virginia.” Id., 
at 23. 
But what does any of that prove? When a party claims 
that a law yields anomalous policy consequences, its usual 
recourse lies in Congress, not in the courts where litigants 
are generally entitled to expect that statutes will “be en-
forced as written.” Epic Systems Corp. v. Lewis, 584 U. S. 
497, 525 (2018); see also Patel v. Garland, 596 U. S. 328, 346 
(2022) (“[P]olicy concerns cannot trump the best interpreta-
tion of the statutory text”). 
amendments the dissent cites promises differential pay even in the ab-
sence of any national emergency. The only possible exception concerns 
an amendment that, among other things, authorized differential pay retro-
actively for certain members of the Coast Guard for a single year, a year 
in which there was already an ongoing national emergency. Post, at 66 
(Thomas, J., dissenting) (discussing § 681(a), 126 Stat. 1795). But even 
assuming that one aspect of that single amendment may represent “some 
redundancy” on our account of § 101(a)(13)(B), the dissent's interpretation 
results in redundancies of its own and encounters so many other diffcul-
ties that we think the “better overall reading of the statute” remains the 
one we pursue. Rimini Street, Inc. v. Oracle USA, Inc., 586 U. S. 334, 
346 (2019). 
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Opinion of the Court 
Nor, even taken on their own terms, are the potential con-
sequences the government highlights all that anomalous. 
Members of the Armed Forces facing court-martial are en-
titled to their military wages until convicted, 10 U. S. C. 
§ 857(a)(1), and they are presumed innocent until proven 
guilty, § 851(c)(1). In light of those statutory directions, it 
is hardly absurd to think Congress might have also wanted 
a reservist to receive differential pay when called to active 
duty to answer a court-martial that might acquit him. Much 
the same goes for reservists called to active duty for train-
ing. Whether that training entails learning the fner points 
of the Uniform Code of Military Justice or attending Air-
borne School, well-trained reservists are ones the Nation can 
call on at a moment's notice, as it often has. See, e. g., Brief 
for State of Texas et al. as Amici Curiae 20 (“Within min-
utes of the September 11 attacks, National Guard and Re-
servists responded to the call to duty”).
6 
* 
In the end, we are persuaded that the statutory language 
means what its terms most naturally suggest: A federal ci-
vilian employee called to active duty pursuant to “any other 
provision of law . . . during a national emergency” is entitled 
to differential pay without having to prove that his service 
6 The dissent expresses concern that our interpretation might lead to 
other “untold consequences,” like expanding the “availability of civilian 
court[s]-martial” or exempting the Department of Defense from having to 
notify Congress before entering into certain real-estate transactions. 
Post, at 63 (opinion of Thomas, J.) (citing 10 U. S. C. §§ 802(a)(10) and 
2662(f)(1)(E)). We express no views on the dissent's claims except to ob-
serve two things. First, as the dissent acknowledges, considerations of 
constitutional avoidance might counsel in favor of a narrowing construc-
tion of certain laws governing courts-martial. See post, at 63 (opinion of 
Thomas, J.). Second, the result the dissent posits with respect to real-
estate transactions is neither unthinkable nor something Congress could 
not alter to the extent the Constitution allows. 
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56 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Thomas, J., dissenting 
was substantively connected in some particular way to some 
particular emergency. Because the Federal Circuit held 
otherwise, its judgment is reversed, and the case is re-
manded for further proceedings consistent with this opinion. 
It is so ordered. 
Justice Thomas, with whom Justice Alito , Justice 
Kagan, and Justice Jackson join, dissenting. 
Federal civilian employees who also serve as military re-
servists are entitled to “differential pay” when they are 
called to active-duty service “during a national emergency.” 
See 5 U. S. C. § 5538; 10 U. S. C. § 101(a)(13)(B). Differential 
pay compensates such reservists for the difference between 
their military and civilian salaries when active-duty service 
would otherwise cause a pay cut. The question before us 
is what Congress meant by the phrase “during a national 
emergency.” Depending on the context, that phrase could 
require only that a national emergency be concurrently ongo-
ing, or it could require that a reservist's service also be in 
support of a particular national emergency. Given the con-
text here, I would conclude that a reservist is called to serve 
“during a national emergency” only if his call comes in the 
course of an operation responding to a national emergency. 
Because the Court requires only that an emergency be con-
currently ongoing, I respectfully dissent. 
I 
A 
“Tens of thousands” of federal civilian employees also 
serve our Nation as military reservists. Ante, at 41. 
Sometimes these individuals earn lower salaries when called 
into active-duty military service than they do in their regu-
lar jobs. To mitigate this disparity, in 2009 Congress passed 
the so-called “differential pay” statute, which ensures that 
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Thomas, J., dissenting 
qualifying reservists will continue to receive the amount of 
their civilian Government salaries while on active duty. See 
§ 751, 123 Stat. 693–695, as amended, 5 U. S. C. § 5538. The 
reservist's civilian employer is responsible for paying the dif-
ference. § 5538(c)(1). 
The statute does not, however, grant a blanket authoriza-
tion for differential pay. Instead, it makes a federal civilian 
employee eligible if, as relevant here, he is called to active 
duty “under . . . a provision of law referred to in section 
101(a)(13)(B) of title 10.” § 5538(a). 
Section 101(a)(13)(B) is one part of the military's defnition 
of “ `contingency operation.' ” This statute defnes a “con-
tingency operation” as “a military operation that”: 
“(A) is designated by the Secretary of Defense as an 
operation in which members of the armed forces are or 
may become involved in military actions, operations, or 
hostilities against an enemy of the United States or 
against an opposing military force; or 
“(B) results in the call or order to, or retention on, 
active duty of members of the uniformed services under 
section 688, 12301(a), 12302, 12304, 12304a, 12305, or 
12406 of this title, chapter 13 of this title, section 3713 
of title 14, or any other provision of law during a war or 
during a national emergency declared by the President 
or Congress.” 
The list of cross-referenced provisions in § 101(a)(13)(B) 
has evolved since Congress frst enacted this defnition in 
1991, but Congress has throughout maintained a catchall for 
calls to active-duty service under other provisions “during 
a war or during a national emergency.” See § 631(a), 105 
Stat. 1380. 
B 
Petitioner Nick Feliciano is an air traffc controller for the 
Federal Aviation Administration (FAA) who also served as 
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58 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Thomas, J., dissenting 
a reserve offcer for the United States Coast Guard. The 
Coast Guard called him to active-duty service for much of 
the period between July 2012 and February 2017. 
Pursuant to Coast Guard policy, each time it called him to 
active duty, the Coast Guard provided Feliciano orders list-
ing the basis for its call. As relevant here, three of Feli-
ciano's calls specifed that he was being “called up under 10 
U. S. C. 12301(d) per Executive Order 13223.” App. to Pet. 
for Cert. 75a–76a; App. in No. 22–1219 (CA Fed.), p. 129. 
Section 12301(d) is not one of the provisions specifcally enu-
merated in § 101(a)(13)(B). It authorizes the Government to 
“order a member of a reserve component . . . to active duty, 
. . . with the consent of that member.” § 12301(d). 
Executive Order No. 13223, in turn, authorizes the military 
to call reservists to active duty in furtherance of the national 
emergency declared after the September 11 terrorist at-
tacks. 3 CFR 785 (2001 Comp.). Consistent with that di-
rective, Feliciano's § 12301(d) orders noted that he was being 
called “in support of a DOD contingency operation,” while 
also listing the relevant operations. App. to Pet. for Cert. 
75a–76a; App. in No. 22–1219, at 129. 
Feliciano did not immediately seek differential pay from 
the FAA for his service under these orders. He instead 
raised the issue in a 2018 appeal to the Merit Systems Pro-
tection Board (MSPB), as part of a complaint alleging that 
the FAA had subjected him to a hostile work environment. 
The MSPB denied Feliciano's request for differential pay. 
The United States Court of Appeals for the Federal Cir-
cuit affrmed. 2023 WL 3449138, *1 (May 15, 2023). Feli-
ciano's case turned on whether he had established that his 
service occurred “during a national emergency” within the 
meaning of § 101(a)(13)(B). The Federal Circuit concluded 
that he had not: Under Circuit precedent, Feliciano needed 
to show a “connection between his service and [an] ongoing 
national emergency,” id., at *2, such that he was “directly 
called to serve in a contingency operation,” Adams v. De-
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Thomas, J., dissenting 
partment of Homeland Security , 3 F. 4th 1375, 1379 (CA Fed. 
2021). But, notwithstanding the language on the face of his 
orders suggesting that his service was connected to the post-
September 11 emergency, Feliciano did not “alleg[e] any con-
nection.” 2023 WL 3449138, *2. Instead, he argued only 
that the Federal Circuit's precedent was wrong, and that any 
active-duty service should count if there is a national emer-
gency ongoing. We granted certiorari. 
II 
A 
This case turns on the meaning of the word “during” in 
§ 101(a)(13)(B). The parties dispute whether the phrase 
“during a national emergency” covers any reservist who per-
forms active-duty service while a national emergency is on-
going, or whether it requires a connection between the serv-
ice and the emergency. 
As with other common words, the meaning of “during” 
“depends on the context in and purpose for which it is used.” 
Wachovia Bank, N. A. v. Schmidt, 546 U. S. 303, 318 (2006). 
Sometimes, “during” can merely “denot[e] a temporal link,” 
wherein one event need only occur while another event is 
ongoing. United States v. Ressam, 553 U. S. 272, 274 (2008). 
Other times, however, we use “during” in a narrower, rela-
tional sense, to reference only events that are substantively 
connected to the ongoing event—that is, events that occur 
“in the course of” or “in the process of” the ongoing event. 
See 3 Oxford English Dictionary 1055 (2d ed. 1989) (emphasis 
deleted); 4 id., at 1134. 
Case law refects this variation. In Ressam, for example, 
we held that the word “during” was used in the broader 
temporal sense in 18 U. S. C. § 844(h), which mandates a sen-
tencing enhancement for defendants who “ `carr[y] an explo-
sive during the commission of [a] felony.' ” 553 U. S., at 274– 
275 (quoting § 844(h)(2)). That enhancement thus applies to 
any defendant whose carrying was “contemporaneous with” 
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60 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Thomas, J., dissenting 
his felony, even if it was not “ `in relation to' the underlying 
felony.” Id., at 273–275. 
Conversely, courts in other contexts have held that the 
word “during” contains a relational component. For in-
stance, several Circuits have recognized this component in 
the Sentencing Guidelines' defnition of “relevant conduct,” 
which encompasses all actions by the defendant “that oc-
curred during the commission of the offense of conviction.” 
United States Sentencing Commission, Guidelines Manual 
§ 1B1.3(a)(1) (Nov. 2024); see, e. g., United States v. Caldwell, 
128 F. 4th 1170, 1180–1183 (CA10 2025) (collecting cases, and 
distinguishing Ressam). “[W]hen defning `relevant con-
duct,' ” they have explained, “the term `during' conveys a 
linkage that is more than a mere temporal overlap; it also 
conveys a qualitative overlap such that the conduct must be 
related or connected to the crime of conviction.” United 
States v. Agyekum, 846 F. 3d 744, 751 (CA4 2017). 
Title 10 also refects this variation. The Government has 
suggested that the similar phrase “[i]n time of national emer-
gency” in § 12302 “speaks only temporally.” Ante, at 46–47 
(citing Tr. of Oral Arg. 61–62). But, other provisions in Title 
10 appear to speak in relational terms. For example, as the 
majority acknowledges, when Congress defned “ `captured 
record' ” to mean certain “material captured during combat 
operations,” it presumably was describing only material cap-
tured in the course of those combat operations. § 427(g)(1); 
see ante, at 50. 
The upshot is that the word “during” does not have a sin-
gle defnition on which to hang our analysis. Instead, to de-
termine its meaning here, we must read the § 101(a)(13)(B) 
catchall “in [its] context and with a view to [its] place in 
the overall statutory scheme.” Davis v. Michigan Dept. of 
Treasury, 489 U. S. 803, 809 (1989). 
B 
The context of § 101(a)(13)(B) makes clear that active-duty 
service occurs “during a national emergency” within the

Cite as: 605 U. S. 38 (2025) 61 
Thomas, J., dissenting 
meaning of that provision only if the service occurs in the 
course of a national emergency. In other words, the reserv-
ist must be called to serve in an operation responding to a 
national emergency. Several important textual clues coun-
sel in favor of this reading. 
1 
To start, the scope of the phrase “during a national emer-
gency” is limited by § 101(a)(13)(B)'s location within Con-
gress's defnition of “contingency operation.” Because “an 
entirely artifcial defnition is rare,” we typically expect the 
meaning of a defnition to be “closely related to the ordinary 
meaning of the word being defned.” A. Scalia & B. Garner, 
Reading Law 228 (2012) (Scalia & Garner). Thus, the “ordi-
nary meaning of a defned term” often “plays a . . . limit-
ing role” when choosing between possible interpretations. 
Bond v. United States, 572 U. S. 844, 861–862 (2014). 
This canon applies with full force here. As a matter of 
ordinary meaning, the term “contingency operation” in Title 
10 refers to the subset of military operations that relates 
to a particular contingency. We should therefore expect 
§ 101(a)(13) to cover only operations that are part of the mili-
tary's response to “emergency” situations or otherwise ne-
cessitated by “required military operations.” Dept. of De-
fense Dictionary of Military and Associated Terms 86 (JCS 
Pub. 1–02 1989). Otherwise, there would be no reason for 
Congress to use “contingency” as a modifying adjective. See 
Weyerhaeuser Co. v. United States Fish and Wildlife Serv., 
586 U. S. 9, 19 (2018) (“Adjectives modify nouns—they pick 
out a subset of a category that possesses a certain quality”). 
The other categories of “contingency operations” in 
§ 101(a)(13) conform to this understanding. Section 
101(a)(13)(A) covers a paradigmatic kind of contingency op-
eration—those wherein members of the military are likely to 
be engaged in opposition to “an enemy of the United States 
or against an opposing military force.” Several of the enu-
merated provisions in § 101(a)(13)(B) similarly cover opera-
tions directly responding to specifc exigent situations. See, 
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62 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
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e. g., § 12304a (“assistance in response to a major disaster or 
emergency”); § 12406 (“invasion” or “rebellion”). And, al-
though the remaining cross-referenced provisions are not 
pegged to specifc exigencies, they too sound in exigency, 
each signaling some reason why a reservist is called to active 
duty. See, e. g., §§ 12301(a), 12302, 12304. 
Because the common thread among these categories is that 
they contemplate only exigent military operations, it follows 
that the same should be true of the “during a national emer-
gency” catchall. We ordinarily read catchall “clauses . . . as 
bringing within a statute categories similar in type to those 
specifcally enumerated.” Federal Maritime Comm'n v. 
Seatrain Lines, Inc., 411 U. S. 726, 734 (1973). The catch-
all here should not be read in a way that eviscerates 
§ 101(a)(13)'s “contingency” focus. 
Tellingly, the military itself has understood the term “con-
tingency operation” to have a fnite scope. Notwithstanding 
the existence of ongoing national emergencies, it has for 
some troop activations issued “orders stat[ing] that they are 
`non-contingency' activation orders.” Adams, 3 F. 4th, at 
1377. For example, like Feliciano, the plaintiff in Adams 
consented to “ `voluntary active duty under [§ ]12301(d),' ” 
but his orders stated that he was being activated in a “ `non-
contingency' ” capacity. Id., at 1377, 1380. 
It follows that the phrase “during a national emergency” 
cannot be understood in purely temporal terms. A purely 
temporal construction would eviscerate the specifcation of 
“contingency operation”: If all military operations that occur 
concurrent with a national emergency are contingency oper-
ations, then any military operation requiring a call to active-
duty service could be a contingency operation, regardless of 
whether there is any contingency involved. Such a capa-
cious reading would implausibly divorce the term from its 
ordinary meaning. 
A review of the other provisions in Title 10 that use the 
term “contingency operation” confrms this implausibility. 
Because § 101(a)(13) is a defnition that “appl[ies throughout] 
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Thomas, J., dissenting 
this title,” see § 101, as well as in other provisions where it is 
incorporated by reference, its defnition must ft the broader 
statutory scheme, Ali v. Federal Bureau of Prisons, 552 
U. S. 214, 222 (2008). There are “dozens of provisions inside 
and outside Title 10 that are applicable to” contingency oper-
ations, and a broad reading of that term would lead to untold 
consequences. Brief for Respondent 22. For example, for 
contracting provisions such as § 2662(f)(1)(E)—where Con-
gress created a reporting requirement but provided an ex-
ception for contingency operations—a purely temporal in-
terpretation of “contingency operation” would invite the 
exception to swallow the rule. Likewise, such an interpre-
tation would mean that—under a provision applying the Uni-
form Code of Military Justice to civilians who accompany 
the U. S. military in the feld “[i]n time of declared war or 
a contingency operation”—the availability of civilian court-
martial could be quite open-ended. § 802(a)(10); see United 
States v. Ali, 71 M. J. 256, 261–262 (C. A. Armed Forces 2012). 
That possibility would run up against our normal under-
standing of court-martial as a “narrow exception” to the 
civilian justice system, and exacerbate any constitutional 
infrmities of this provision. Reid v. Covert, 354 U. S. 1, 
21, 31–33 (1957) (plurality opinion). This implausibility is 
“strong evidence” that the term “contingency operation” 
must retain limiting force. Yegiazaryan v. Smagin, 599 
U. S. 533, 548 (2023). 
2 
The need for “contingency operation” to retain limiting 
force is particularly apparent because Congress enacted 
§ 101(a)(13)(B) against a backdrop of indefnite and continual 
national emergencies. With the exception of a 1-year inter-
regnum from 1978 to 1979, the United States has had at least 
one national emergency in effect at all times since 1933.
1 
1 Congress took note of this problem in the 1970s. S. Rep. No. 93–549, 
p. III (1973). It passed the National Emergencies Act in 1976, which or-
dered that the then-existing emergencies be terminated as of 1978. 
§ 101(a), 90 Stat. 1255 (codifed at 50 U. S. C. § 1601(a)). But, the President 
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64 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Thomas, J., dissenting 
Thus, when Congress passed § 101(a)(13)(B) in 1991, it would 
have expected that some national emergency or other would 
generally be in effect. It strains credulity to think that 
Congress could have meant “contingency operation” to mean, 
as a practical matter, essentially every military operation.
2 
To the extent there could be any doubt, the structure of 
§ 101(a)(13)(B) confrms that Congress did not intend for 
the “during a national emergency” catchall to be all encom-
passing. After all, Congress created that provision as a 
catchall to a long list of enumerated provisions. As origi-
nally enacted, § 101(a)(13)(B) specifed that a “military opera-
tion” would qualify as a “ `contingency operation' ” if it “re-
sults in the call or order to, or retention on, active duty” of 
troops pursuant to one of seven enumerated provisions, one 
enumerated chapter of provisions, or “any other provision of 
law during a war or during a national emergency.” 105 
Stat. 1380. Congress has maintained this structure since 
then. The only changes it has made have been to enumerate 
additional statutes. See § 101(a)(13)(B). 
Congress's focus on a reservist's “call or order” to active 
duty and whether that “call or order” arises under specifc 
provisions of law suggests that Congress cared about the 
soon proclaimed a new emergency to order sanctions against Iran. Exec. 
Order No. 12170, 3 CFR 457 (1979 Comp.). That emergency remains in 
effect to this day, alongside several dozen other emergencies since desig-
nated. 89 Fed. Reg. 87761 (2024). 
2 Reading the term “contingency operation” to cover all military opera-
tions that occur while a national emergency is also ongoing would appear 
particularly incongruent given the nonmilitary nature of many emergen-
cies. In the years leading up to the 1991 enactment of 10 U. S. C. 
§ 101(a)(13), almost all the emergency proclamations in effect concerned 
economic sanctions. See Brennan Center for Justice, Declared National 
Emergencies Under the National Emergencies Act (last updated Apr. 7, 
2025), https:// brennancenter.org/our-work/research-reports/declared -
national-emergencies-under-national-emergencies-act. It is not apparent 
why the existence of unrelated sanctions, administered by nonmilitary of-
fcials, would transform routine military operations into contingency oper-
ations as a matter of ordinary understanding. 
Page Proof Pending Publication

Cite as: 605 U. S. 38 (2025) 65 
Thomas, J., dissenting 
contents of and the basis for a reservist's activation orders. 
If Congress had meant to effectively deem all operations re-
quiring calls to active-duty service as occurring “during a 
national emergency,” then its list of enumerated provisions 
would have been unnecessary. Because some emergency is 
invariably ongoing, Congress could have omitted all those 
enumerations without any meaningful difference. 
The superfuity involved in a purely temporal reading is a 
strong sign that a military operation occurs “during a na-
tional emergency” only if it occurs in the course of the Gov-
ernment's response to a national emergency. Because we 
interpret statutes, where possible, to avoid superfuity, we 
strive to avoid interpretations that “would in practical effect 
render [statutory language] entirely superfuous in all but 
the most unusual circumstances.” TRW Inc. v. Andrews, 
534 U. S. 19, 29 (2001). We likewise strive to avoid “un-
bounded interpretation[s]” of a catchall that would “render 
superfuous” Congress's provision of “a reticulated list” else-
where in the statute. Fischer v. United States, 603 U. S. 
480, 493 (2024). Reading “during a national emergency” in 
§ 101(a)(13)(B) to reach only operations undertaken in the 
course of the national emergency would avoid these disfa-
vored interpretive outcomes. 
3 
The postenactment history of both § 101(a)(13)(B) and the 
differential-pay statute that incorporates that provision fur-
ther counsel in favor of reading “during a national emer-
gency” narrowly. It is well established that “subsequent 
acts can shape or focus” our selection between possible statu-
tory meanings. FDA v. Brown & Williamson Tobacco 
Corp., 529 U. S. 120, 143 (2000). And, in particular, we must 
read “a change in [statutory] language . . . , if possible, to 
have some effect.” American Nat. Red Cross v. S. G., 505 
U. S. 247, 263 (1992). But here, Congress's postenactment 
amendments would be superfuous if all military operations 
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66 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Thomas, J., dissenting 
were already contingency operations through the “during a 
national emergency” catchall. 
Most notably, Congress in 2013 amended § 101(a)(13)(B) to 
specify that military operations requiring troop activations 
under what is now 14 U. S. C. § 3713—a provision allowing 
for the emergency activation of Coast Guard reservists in 
certain circumstances—would henceforth qualify as contin-
gency operations. § 681(a), 126 Stat. 1795. Congress also 
specifed that this amendment would be “retroactive” for one 
year for purposes of differential pay. § 681(d)(2)(A), id., at 
1796. But, if the phrase “during a national emergency” 
makes all military operations contingency operations while a 
national emergency is in effect, then this amendment and its 
retroactivity provision would have been wholly superfuous. 
With emergencies always in effect, including for the entirety 
of the 1-year retroactivity period, reservists activated pursu-
ant to the Coast Guard provision would already have been 
participants in contingency operations and so entitled to dif-
ferential pay. 
Other congressional amendments refect the same prob-
lem. In 2011, Congress amended § 101(a)(13)(B) to deem as 
contingency operations military operations requiring activa-
tions through § 12304a, which allows certain reservists to be 
called to active duty “[w]hen a Governor requests Federal 
assistance in responding to a major disaster or emergency.” 
§ 515(a), 125 Stat. 1394. And, in 2018, Congress amended 
the differential-pay statute to entitle reservists activated 
under 10 U. S. C. § 12304b to differential pay. § 605, 132 
Stat. 1795. That provision allows activations for “pre-
planned mission[s] in support of a combatant command.” 
§ 12304b(a). But, given the backdrop of constant national 
emergencies, these changes could have little, if any, practical 
effect if § 101(a)(13)(B) already made all military operations 
contingency operations so long as an emergency is ongoing. 
Because we disfavor statutory interpretations that would 
render statutory language all but superfuous “in practical 
Page Proof Pending Publication

Cite as: 605 U. S. 38 (2025) 67 
Thomas, J., dissenting 
effect,” it makes little sense to conclude that Congress 
enacted these amendments in case of a hypothetical day 
without emergencies. TRW, 534 U. S., at 29. This statu-
tory history therefore provides another reason to adopt a 
cabined reading of the “during a national emergency” 
language. 
* * * 
Taken together, these contextual clues establish that the 
“during a national emergency” catchall in § 101(a)(13)(B) 
reaches only military operations conducted in response to a 
national emergency. The differential-pay statute, in cover-
ing any reservist who is called to active duty “pursuant to a 
call or order” under “a provision of law referred to in section 
101(a)(13)(B),” incorporates § 101(a)(13)(B)'s limits. 5 
U. S. C. § 5538(a). Thus, the statutory context of 10 U. S. C. 
§ 101(a)(13)(B) also establishes that a reservist qualifies for 
differential pay under the “catchall” only if he is called to 
serve in an operation responding to a national emergency. 
Reservists cannot benefit if they are called to serve merely 
while other, unrelated emergency responses are ongoing. 
III 
The majority does not persuasively grapple with the fore-
going evidence of § 101(a)(13)(B)'s meaning. At most, its 
reasoning suggests that Congress could have spoken more 
clearly. But, that conclusion cannot justify the Court's deci-
sion today. 
As an initial matter, the majority wrongly puts a thumb 
on the scale in favor of reading the word “during” in a purely 
temporal sense. “Normally,” it says, “that word `denotes a 
temporal link' and means `contemporaneous with.' ” Ante, at 
44 (quoting Ressam, 553 U. S., at 274–275). But, as the major-
ity later acknowledges, the meaning of “during” is context 
dependent. Ante, at 49–50; supra, at 59–60. Often, “ordi-
nary reader[s]” will read “during” to “require both a tempo-
ral and substantive connection.” Ante, at 50. Our decision 
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68 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Thomas, J., dissenting 
in Ressam is not to the contrary: It stated only that the 
purely temporal sense was “the most natural reading of the 
word as used in the statute” at issue. 553 U. S., at 274–275 
(emphasis added). 
Even if the majority were right about “during” as a gen-
eral matter, we still must read statutes in context. See 
Home Depot U. S. A., Inc. v. Jackson, 587 U. S. 435, 441 
(2019) (narrowly reading a term that, “standing alone, is 
broad”). Here, the majority too quickly brushes aside the 
key contextual clues in the scheme before us. 
To start, the majority cannot disregard the ordinary mean-
ing of “contingency operation” on the ground that we are 
interpreting an “express statutory defnition” of that term. 
Ante, at 50–51, n. 4. When the meaning of a statutory def-
nition is unclear, “the ordinary meaning of the term . . . is 
one of `the most important' factors we can consider.” Delli-
gatti v. United States, 604 U. S. 423, 438 (2025) (quoting 
Scalia & Garner 228); see supra, at 61. And, even on the 
majority's view, the meaning of § 101(a)(13)(B) is at least de-
batable: The majority acknowledges the “force” of counter-
vailing arguments, and it all but admits that its reading gen-
erates superfuity, at least as to Congress's retroactive 
provision of differential pay under the Coast Guard amend-
ment. Ante, at 49, 53–54, n. 5. 
The majority cannot dodge the larger superfuity problem 
raised by its overbroad reading either. The majority specu-
lates that there could be a day where no national emergen-
cies are in effect. Ante, at 52–53. But, given the fve-plus 
decades of national emergencies against which Congress leg-
islated, that possibility is far too remote to refect Congress's 
likely intention in enacting § 101(a)(13)(B). And, Congress's 
postenactment amendments—including the retroactive 
amendment—only further confrm that it intended all of 
§ 101(a)(13)(B) to have present effect. 
The majority downplays the ripple effects its opinion will 
have for the term “contingency operation” as used in other 
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Cite as: 605 U. S. 38 (2025) 69 
Thomas, J., dissenting 
provisions. Notwithstanding its decision to defne “contin-
gency operation” to mean essentially “any military opera-
tion,” the majority offers “no views” on the full consequences 
of its interpretation. Ante, at 55, n. 6. But, Congress made 
§ 101(a)(13) the definition for “contingency operation” 
throughout Chapter 10 and beyond, and so we “must, to the 
extent possible, ensure that the statutory scheme is coherent 
and consistent.” Ali, 552 U. S., at 222. We cannot leave 
that obligation for another day. 
The majority's competing textual arguments are also un-
availing. The majority invokes the presumption of consist-
ent usage and the canon of meaningful variation to argue 
that a comparison with other statutes shows that “during” 
in § 101(a)(13)(B) is merely temporal. Under these princi-
ples, “[i]n a given statute, the same term usually has the 
same meaning and different terms usually have different 
meanings.” Pulsifer v. United States, 601 U. S. 124, 149 
(2024). Thus, the majority argues, it is noteworthy that 
Congress used only the word “during,” given that other 
Code provisions use “during” or equivalent language in a 
purely temporal sense. Ante, at 53. If Congress had 
wanted to reach only active-duty service undertaken in the 
course of a national emergency, the majority posits, it would 
have borrowed different, clearer language, such as “during 
and in relation to.” Ante, at 46. These arguments are true 
as far as they go, but they go only so far. 
Because “drafters more than rarely use the same word to 
denote different concepts, and often . . . use different words 
to denote the same concept,” inferences like the majority's 
are “particularly defeasible by context.” Scalia & Garner 
170–171. And, the presumption of consistent usage and 
canon of meaningful variation carry especially little weight 
when applied to words that are “ubiquitous” and “context-
dependent,” whose use drafters are not “likely to keep track 
of and standardize.” Pulsifer, 601 U. S., at 149. That is the 
case with a preposition such as “during,” which even the ma-
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70 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Thomas, J., dissenting 
jority acknowledges to be context dependent, including in its 
meaning elsewhere in Title 10. See ante, at 50; supra, at 
60. Thus, the majority's arguments on this front cannot be 
controlling.3 
Likewise, the interaction of the differential-pay statute 
with 18 U. S. C. § 209 does not move the needle. That stat-
ute criminally bars private parties from supplementing a 
federal employee's salary, but it creates an exception for par-
ties who give differential pay to reservists serving on “active 
duty under a provision of law referred to in section 
101(a)(13).” §§ 209(a), (h). The majority warns that a nar-
row reading of 10 U. S. C. § 101(a)(13) could create liability 
for private employers who mistakenly believe an employee 
to be serving in the course of a national emergency. Ante, 
at 47–48. But, even setting aside that such employers would 
likely have a mens rea defense, see ante, at 48, n. 3, this 
argument for lenity can be relevant only if, “at the end of 
the process of construing what Congress has expressed[,] . . . 
the ordinary canons of statutory construction have revealed 
no satisfactory construction,” Lockhart v. United States, 577 
U. S. 347, 361 (2016) (internal quotation marks omitted). 
Here, those ordinary canons supply an answer. 
No more availing is the majority's invocation of the 
Congressional Budget Offce (CBO) as evidence of what 
an “ordinary reader” might think. Ante, at 48. The major-
ity highlights that CBO at one point applied the majority's 
reading when estimating the cost of “potential legislation 
featuring [similar] terms.” Ibid. But, as the majority ac-
3 The majority emphasizes the Government's concession that § 12302, one 
of the provisions enumerated in § 101(a)(13)(B), “speaks only temporally” 
when “authoriz[ing] the activation of various reservists `[i]n time of na-
tional emergency.' ” Ante, at 46–47; see supra, at 60. Whatever the mer-
its of that concession, it does not help the majority. Even when read purely 
temporally, § 12302—which allows the Government to maintain “[i]n time 
of national emergency” a limited “Ready Reserve” of troops who can be 
activated as needed—has a clear exigency focus. It does not support the 
majority's near-boundless interpretation of the § 101(a)(13)(B) catchall. 
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Cite as: 605 U. S. 38 (2025) 71 
Thomas, J., dissenting 
knowledges, “no one votes for CBO reports,” and courts owe 
CBO “no rote deference.” Ibid. It is not apparent, then, 
why CBO's reports are relevant—particularly given that the 
reports contain no interpretive analysis.
4 That one general-
ist agency, for unknown reasons, once shared the majority's 
view is hardly compelling evidence of § 101(a)(13)(B)'s mean-
ing, especially given the weight of the interpretive clues and 
the practice of the military itself. See supra, at 61–62. 
Finally, the majority cannot fall back on workability con-
cerns. The majority asks how a substantive standard can 
be discerned from the “during a national emergency” lan-
guage, pointing to the somewhat different formulations that 
the Government and I have used compared to the Federal 
Circuit's. Ante, at 47, 49. But, “[i]t is not our place to 
question whether Congress adopted the . . . most workable 
policy, only to discern and apply the policy it did adopt.” 
Ysleta del Sur Pueblo v. Texas, 596 U. S. 685, 706 (2022). 
In any event, the majority's concerns are unjustifed. 
However formulated, the inquiry should ordinarily be 
straightforward. A reservist is eligible for differential pay 
through the “during a national emergency” catchall if he is 
called to active-duty service in an operation responding to 
such an emergency. The nature of an activation can ordi-
narily be determined from the face of the reservist's activa-
tion orders, which, under Department of Defense and Coast 
Guard policies, must state whether he is being activated in 
support of a contingency operation. Brief for Respondent 
23–24; see Adams, 3 F. 4th, at 1379. If there is any ambigu-
ity, the reservist or his civilian employer can obtain clarif-
cation. Offce of Personnel Management, OPM Policy Guid-
ance Regarding Reservist Differential Under 5 U. S. C. 5538, 
p. 23 (rev. June 23, 2015), https://www.opm.gov/policy-
4 For the reports, see CBO, Cost Estimate, S. 593: Reservist Pay Secu-
rity Act of 2004, pp. 2–3 (Aug. 4, 2004); CBO, Cost Estimate, S. 2400: 
Ronald W. Reagan National Defense Authorization Act for Fiscal Year 
2005, p. 9 (July 21, 2004). 
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72 FELICIANO v. DEPARTMENT OF TRANSPORTATION 
Thomas, J., dissenting 
data-oversight/pay-leave/pay-administration/reservist -
differential/policyguidance.pdf. The majority has no basis 
to deviate from the commands of statutory text. 
* * * 
My interpretive conclusion does not mean that Feliciano 
should be denied differential pay. As even the Government 
admits, Feliciano's “orders indicate that [he] would have been 
entitled to differential pay” under a proper reading of 
§ 101(a)(13)(B) because they indicate that he was being called 
to active duty to support the Coast Guard's response to a 
national emergency. Brief for Respondent 36; see supra, at 
58. The Government argues, however, that petitioner has 
forfeited any entitlement. Because we are not a court of 
frst view, I would vacate and remand so that the Federal 
Circuit may assess these issues in the frst instance. The 
majority instead grants Feliciano relief based on a misread-
ing of the statute. I respectfully dissent. 
Page Proof Pending Publication

Page Proof Pending Publication
Reporter’s Note 
The attached opinion has been revised to refect the usual publication 
and citation style of the United States Reports. The revised pagination 
makes available the offcial United States Reports citation in advance of 
publication. The syllabus has been prepared by the Reporter of Decisions 
for the convenience of the reader and constitutes no part of the opinion of 
the Court. A list of counsel who argued or fled briefs in this case, and 
who were members of the bar of this Court at the time this case was 
argued, has been inserted following the syllabus. Other revisions may 
include adjustments to formatting, captions, citation form, and any errant 
punctuation. The following additional edits were made: 
None

Retrieval chunks

• #1

  PRELIMINARY PRINT Volume 605 U. S. Part 1 Pages 38–72 OFFICIAL REPORTS OF THE SUPREME COURT April 30, 2025 REBECCA A. WOMELDORF reporter of decisions Page Proof Pending Publication NOTICE: This preliminary print is subject to formal revision before the bound volume is published. Users are requested to notif…

• #2

  quires differential pay for federal civilian employee reservists ordered to active duty “under . . . a provision of law referred to in” § 101(a)(13)(B). Section 101(a)(13)(B) defnes “contingency operation” to include operations that result in the call to active duty of servicemem- bers under several enumerated sta…

• #3

  alone. See Ysleta del Sur Pueblo v. Texas, 596 U. S. 685, 704. Addi- tionally, one of the specifc provisions that can trigger differential pay, 10 U. S. C. § 12302, authorizes activation of reservists “[i]n time of national emergency”—language the government contends speaks only tempo- rally. If that phrase requir…

• #4

  the potential policy consequences the government highlights cannot overcome the statute's most natural reading. Pp. 49–56. Reversed and remanded. Gorsuch, J., delivered the opinion of the Court, in which Roberts, C. J., and Sotomayor, Kavanaugh, and Barrett, JJ., joined. Thomas, J., fled a dissenting opinion, in …

• #5

  ministration as an air traffc controller in 2005. App. to Pet. for Cert. 9a. At the same time, Mr. Feliciano served as a reserve petty offcer in the United States Coast Guard. Ibid.; Brief for Respondent 6. In July 2012, the Coast Philip J. Weiser of Colorado, William Tong of Connecticut, Brian L. Schwalb of the …

• #6

  claimed the FAA had created a hostile work environment and unlawfully denied him differential pay during the time he spent serving on active duty under § 12301(d). After the Board rejected his claims, see id., at 29a–30a, 37a, Mr. Felici- ano appealed to the Federal Circuit. On appeal, Mr. Feliciano argued that t…

• #7

  Mr. Feliciano had not made that second showing, the court held, he was not entitled to differential pay. Id., at 3a–4a. 1 Section 101(a)(13)(A) forms the other part of the defnition of the phrase “contingency operation.” It provides that “contingency opera- tion” also includes “a military operation that . . . is d…

• #8

  course of” or “at some point in the course of”); American Heritage Diction- ary 572 (3d ed. 1992) (during: “[t]hroughout the course or duration of” or “[a]t some time in”). Dictionaries from the time of § 5538's enactment in 2009 say the same. See, e. g., American Heritage Dictionary 556 (4th ed. 2006) (during: “[…

• #9

  called up to active duty “during” a national emergency is entitled to differential pay if, and only if, he can prove his 46 FELICIANO v. DEPARTMENT OF TRANSPORTATION Opinion of the Court service has a “substantive connection” to a particular emer- gency? We doubt it. B Strengthening our conviction on this score…

• #10

  the phrase “[i]n time of a national emergency” in § 12302 re- quires no substantive connection, how might “during a na- tional emergency” in § 101(a)(13)(B) do so? If a plausible ex- planation exists for interpreting the one phrase, but not the other, to require a substantive connection, the government does not s…

• #11

  cost estimates to help Members of Congress understand the likely impact of their proposed legislation. See, e. g., Con- gressional Research Service, J. Saturno, Introduction to the Federal Budget Process 19 (Jan. 10, 2023). And when CBO scored potential legislation featuring terms that largely mir- ror those now …

• #12

  quire only a temporal connection but “during a national emergency” must be read to demand more. They discount CBO's practice. And they nowhere offer a principled basis for preferring the substantive connection they propose over the alternative the Federal Circuit offered. To be sure, the three central arguments t…

• #13

  ing a national emergency bolsters the government's capacity to address that emergency; his work on everyday matters may free up others to handle emergent ones. Notably, the government itself argues that Congress has sometimes taken just this view, promising differential pay to certain reserv- ists called to activ…

• #14

  583 U. S. 149, 160 (2018). That defnition includes a military operation that results in a call to active duty under certain specifcally enumerated statutory authorities or under any other law “during a national emer- gency.” As even the dissent admits, some of the specifcally enumerated statutory authorities are “…

• #15

  Maybe so, but maybe not. In the 1970s, the elected branches did something nearly like what the government today considers unthinkable. In 1976, Congress passed and President Ford signed the National Emergencies Act, which effectively ended then-existing emergencies and established procedures for declaring (and co…

• #16

  cussed, the statute supplies no obviously principled way for us to resolve what that connection might be. See Part II– B, supra. 5 5 The dissent also insists that our reading would render superfuous vari- ous postenactment amendments that have expanded the list of provisions enumerated in § 101(a)(13)(B). Post, …

• #17

  one we pursue. Rimini Street, Inc. v. Oracle USA, Inc., 586 U. S. 334, 346 (2019). Page Proof Pending Publication Cite as: 605 U. S. 38 (2025) 55 Opinion of the Court Nor, even taken on their own terms, are the potential con- sequences the government highlights all that anomalous. Members of the Armed Forces fa…

• #18

  was substantively connected in some particular way to some particular emergency. Because the Federal Circuit held otherwise, its judgment is reversed, and the case is re- manded for further proceedings consistent with this opinion. It is so ordered. Justice Thomas, with whom Justice Alito , Justice Kagan, and Ju…

• #19

  of “ `contingency operation.' ” This statute defnes a “con- tingency operation” as “a military operation that”: “(A) is designated by the Secretary of Defense as an operation in which members of the armed forces are or may become involved in military actions, operations, or hostilities against an enemy of the Uni…

• #20

  75a–76a; App. in No. 22–1219, at 129. Feliciano did not immediately seek differential pay from the FAA for his service under these orders. He instead raised the issue in a 2018 appeal to the Merit Systems Pro- tection Board (MSPB), as part of a complaint alleging that the FAA had subjected him to a hostile work e…

• #21

  Case law refects this variation. In Ressam, for example, we held that the word “during” was used in the broader temporal sense in 18 U. S. C. § 844(h), which mandates a sen- tencing enhancement for defendants who “ `carr[y] an explo- sive during the commission of [a] felony.' ” 553 U. S., at 274– 275 (quoting § 8…

• #22

  The context of § 101(a)(13)(B) makes clear that active-duty service occurs “during a national emergency” within the Cite as: 605 U. S. 38 (2025) 61 Thomas, J., dissenting meaning of that provision only if the service occurs in the course of a national emergency. In other words, the reserv- ist must be called to …

• #23

  emergency”); § 12406 (“invasion” or “rebellion”). And, al- though the remaining cross-referenced provisions are not pegged to specifc exigencies, they too sound in exigency, each signaling some reason why a reservist is called to active duty. See, e. g., §§ 12301(a), 12302, 12304. Because the common thread among …

• #24

  ations, and a broad reading of that term would lead to untold consequences. Brief for Respondent 22. For example, for contracting provisions such as § 2662(f)(1)(E)—where Con- gress created a reporting requirement but provided an ex- ception for contingency operations—a purely temporal in- terpretation of “contin…

• #25

  passing. After all, Congress created that provision as a catchall to a long list of enumerated provisions. As origi- nally enacted, § 101(a)(13)(B) specifed that a “military opera- tion” would qualify as a “ `contingency operation' ” if it “re- sults in the call or order to, or retention on, active duty” of troop…

• #26

  strong sign that a military operation occurs “during a na- tional emergency” only if it occurs in the course of the Gov- ernment's response to a national emergency. Because we interpret statutes, where possible, to avoid superfuity, we strive to avoid interpretations that “would in practical effect render [statut…

• #27

  With emergencies always in effect, including for the entirety of the 1-year retroactivity period, reservists activated pursu- ant to the Coast Guard provision would already have been participants in contingency operations and so entitled to dif- ferential pay. Other congressional amendments refect the same prob- …

• #28

  The majority does not persuasively grapple with the fore- going evidence of § 101(a)(13)(B)'s meaning. At most, its reasoning suggests that Congress could have spoken more clearly. But, that conclusion cannot justify the Court's deci- sion today. As an initial matter, the majority wrongly puts a thumb on the sca…

• #29

  decades of national emergencies against which Congress leg- islated, that possibility is far too remote to refect Congress's likely intention in enacting § 101(a)(13)(B). And, Congress's postenactment amendments—including the retroactive amendment—only further confrm that it intended all of § 101(a)(13)(B) to hav…

• #30

  dependent,” whose use drafters are not “likely to keep track of and standardize.” Pulsifer, 601 U. S., at 149. That is the case with a preposition such as “during,” which even the ma- Page Proof Pending Publication 70 FELICIANO v. DEPARTMENT OF TRANSPORTATION Thomas, J., dissenting jority acknowledges to be cont…

• #31

  activated as needed—has a clear exigency focus. It does not support the majority's near-boundless interpretation of the § 101(a)(13)(B) catchall. Page Proof Pending Publication Cite as: 605 U. S. 38 (2025) 71 Thomas, J., dissenting knowledges, “no one votes for CBO reports,” and courts owe CBO “no rote deference…

• #32

  data-oversight/pay-leave/pay-administration/reservist - differential/policyguidance.pdf. The majority has no basis to deviate from the commands of statutory text. * * * My interpretive conclusion does not mean that Feliciano should be denied differential pay. As even the Government admits, Feliciano's “orders in…