The Government resists giving “personnel” its plain meaning on the ground that Congress, when drafting Exemption 2, considered but chose not to enact language exempting “internal employment rules and practices.” Brief for Respondent 30–34, and n. 11. This drafting history, the Navy maintains, proves that Congress did not wish “to limit the Exemption to employment-related matters,” id., at 31, even if the adjective “personnel” conveys that meaning in other contexts, id., at 41. But we think the Navy’s evidence insufficient: The scant history concerning this word change as easily supports the inference that Congress merely swapped one synonym for another. Cf. Mead Corp. v. Tilley, 490 U. S. 714, 723 (1989) (noting with respect to the “unexplained disappearance of one word from an unenacted bill” that “mute intermediate legislative maneuvers are not reliable” aids to statutory interpretation (internal quotation marks omitted)). Those of us who make use of legislative history believe that clear evidence of congressional intent may illuminate ambiguous text. We will not take the opposite tack of allowing ambiguous legislative history to muddy clear statutory language:chanrobles.com-red

Exemption 2, as we have construed it, does not reach the ESQD information at issue here. These data and maps calculate and visually portray the magnitude of hypothetical detonations. By no stretch of imagination do they relate to “personnel rules and practices,” as that term is most naturally understood. They concern the physical rules governing explosives, not the workplace rules governing sailors; they address the handling of dangerous materials, not the treatment of employees. The Navy therefore may not use Exemption 2, interpreted in accord with its plain meaning to cover human resources matters, to prevent disclosure of the requested maps and data:chanrobles.com-red

IV

The Government offers two alternative readings of Exemption 2 to support withholding the ESQD information. We cannot square either with the statute:chanrobles.com-red

A

The Navy first encourages us to adopt the construction of Exemption 2 pioneered by Crooker, which shields material not only if it meets the criteria set out above (Low 2), but also if it is “predominant[ly] interna[l]” and its “disclosure would significantly risk[] circumvention of federal agency functions” (High 2). Brief for Respondent 41 (internal quotation marks omitted). The dissent, too, favors this reading of the statute. Post, at 1. But the Crooker interpretation, as already suggested, suffers from a patent flaw: It is disconnected from Exemption 2’s text. The High 2 test (in addition to substituting the word “predominantly” for “solely,” see n. 1, supra) ignores the plain meaning of the adjective “personnel,” see supra, at 6–9, and adopts a circumvention requirement with no basis or referent in Exemption 2’s language. Indeed, the only way to arrive at High 2 is by taking a red pen to the statute—“cutting out some” words and “pasting in others” until little of the actual provision remains. Elliott v. Department of Agriculture, 596 F. 3d 842, 845 (CADC 2010). Because this is so, High 2 is better labeled “Non 2” (and Low 2 … just 2):chanrobles.com-red

In support of its text-light approach to the statute, the Government relies primarily on legislative history, placing particular emphasis on the House Report concerning FOIA. See Brief for Respondent 33–38. A statement in that Report buttresses the High 2 understanding of the exemption and, indeed, specifically rejects the Low 2 construction. According to the Report: “Operating rules, guidelines, and manuals of procedure for Government investigators or examiners would be exempt from disclosure [under Exemption 2], but this exemption would not cover … employee relations and working conditions and routine administrative procedures.” H. R. Rep. No. 1497, 89th Cong., 2d Sess., 10 (1966). But the Senate Report says exactly the opposite, explaining in support of a Low 2 interpretation that the phrase “internal personnel rules and practices of an agency” means “rules as to personnel’s use of parking facilities or regulation of lunch hours, statements of policy as to sick leave, and the like.” S. Rep., at 8.[Footnote 6] In Rose, we gave reasons for thinking the Senate Report the more reliable of the two. See 425 U. S., at 366. But the more fundamental point is what we said before: Legislative history, for those who take it into account, is meant to clear up ambiguity, not create it. See supra, at 9; Wong Yang Sung v. McGrath, 339 U. S. 33, 49 (1950) (declining to consult legislative history when that “history is more conflicting than the text is ambiguous”). When presented, on the one hand, with clear statutory language and, on the other, with dueling committee reports, we must choose the language:chanrobles.com-red

The Government also advances, in support of Crooker’s High 2 approach, an argument based on subsequent legislative action. Congress, the Government notes, amended Exemption 7(E) in 1986 to cover law enforcement records whose production “would disclose techniques and procedures for law enforcement investigations or prosecutions, or would disclose guidelines for law enforcement investigations or prosecutions if such disclosure could reason-ably be expected to risk circumvention of the law.” §552(b)(7)(E). That amendment, the Government contends, codified Crooker’s “circumvention of the law” standard and, in so doing, ratified Crooker’s holding. Brief for Respondent 42–43. The dissent likewise counts as significant that Congress “t[ook] note” of Crooker in revising FOIA. Post, at 9; see post, at 2:chanrobles.com-red

But the Government and the dissent neglect the key feature of the 1986 amendment: Congress modified not Exemption 2 (the subject of Crooker), but instead Exemption 7(E). And the Crooker construction of Exemption 2 renders Exemption 7(E) superfluous and so deprives that amendment of any effect. See, e.g., TRW Inc. v. Andrews, 534 U. S. 19, 31 (2001) (noting canon that statutes should be read to avoid making any provision “superfluous, void, or insignificant” (internal quotation marks omitted)). We cannot think of any document eligible for withholding under Exemption 7(E) that the High 2 reading does not capture: The circumvention standard is the same, and the law enforcement records listed in Exemption 7(E) are “predominantly internal.” So if Congress had agreed with Crooker’s reading of Exemption 2, it would have had no reason to alter Exemption 7(E). In that event, Congress would either have left the statute alone (on the theory that Crooker would do the necessary work) or would have amended Exemption 2 specifically to ratify Crooker. The decision instead to amend Exemption 7(E) suggests that Congress approved the circumvention standard only as to law enforcement materials, and not as to the wider set of records High 2 covers. Perhaps this legislative action does not show that Congress affirmatively disagreed with Crooker; maybe Congress was agnostic about whether the circumvention standard should apply to other records. But one thing is clear: The 1986 amendment does not ratify, approve, or otherwise signal agreement with Crooker’s interpretation of Exemption 2. This argument therefore cannot save the High 2 construction:chanrobles.com-red

The dissent offers one last reason to embrace High 2, and indeed stakes most of its wager on this argument. Crooker, the dissent asserts, “has been consistently relied upon and followed for 30 years” by other lower courts. Post, at 9; see post, at 1–2. But this claim, too, trips at the starting gate. It would be immaterial even if true, because we have no warrant to ignore clear statutory language on the ground that other courts have done so. And in any event, it is not true. Prior to Crooker, three Circuits adopted the reading of Exemption 2 we think right, and they have not changed their minds. See n. 2, supra.[Footnote 7] Since Crooker, three other Circuits have accepted the High 2 reading. See supra, at 3. One Circuit has reserved judgment on the High 2-Low 2 debate. See Audubon Society v. Forest Serv., 104 F. 3d 1201, 1203–1204 (CA10 1997). And the rest have not considered the matter. (No one should think Crooker has been extensively discussed or debated in the Courts of Appeals. In the past three decades, Crooker’s analysis of Exemption 2 has been cited a sum total of five times in federal appellate decisions outside the D. C. Circuit—on average, once every six years.) The result is a 4 to 3 split among the Circuits.[Footnote 8] We will not flout all usual rules of statutory interpretation to take the side of the bare majority:chanrobles.com-red

B

Presumably because Crooker so departs from Exemption 2’s language, the Government also offers another construction, which it says we might adopt “on a clean slate,” “based on the plain text … alone.” Brief for Respondent 15. On this reading, the exemption “encompasses records concerning an agency’s internal rules and practices for its personnel to follow in the discharge of their governmental functions.” Id., at 20; see also id., at 13–14 (Exemption 2 “applies generally to matters concerning internal rules and practices to guide agency personnel in performing their duties”). According to the Government, this interpretation makes sense because “the phrase ‘personnel rules and practices of an agency’ is logically understood to mean an agency’s rules and practices for its personnel.” Id., at 20 (emphasis added):chanrobles.com-red

But the purported logic in the Government’s definition eludes us. We would not say, in ordinary parlance, that a “personnel file” is any file an employee uses, or that a “personnel department” is any department in which an employee serves. No more would we say that a “personnel rule or practice” is any rule or practice that assists an employee in doing her job. The use of the term “personnel” in each of these phrases connotes not that the file or department or practice/rule is for personnel, but rather that the file or department or practice/rule is about personnel—i.e., that it relates to employee relations or human resources. This case well illustrates the point. The records requested, as earlier noted, are explosives data and maps showing the distances that potential blasts travel. This information no doubt assists Navy personnel in storing munitions. But that is not to say that the data and maps relate to “personnel rules and practices.” No one staring at these charts of explosions and using ordinary language would describe them in this manner:chanrobles.com-red

Indeed, the Government’s “clean slate” construction reaches such documents only by stripping the word “personnel” of any real meaning. Under this interpretation, an agency’s “internal personnel rules and practices” appears to mean all its internal rules and practices. That is because agencies necessarily operate through personnel, and so all their internal rules and practices are for personnel. The modifier “personnel,” then, does no modifying work; it does not limit the class of internal rules and practices that Exemption 2 covers. What is most naturally viewed as the provision’s key word—the term that ought to define its scope—does nothing more than state the truism that in an agency it is “personnel” who follow internal rules and practices:chanrobles.com-red

And this odd reading would produce a sweeping exemption, posing the risk that FOIA would become less a disclosure than “a withholding statute.” Mink, 410 U. S., at 79. Many documents an agency generates in some way aid employees in carrying out their responsibilities. If Exemption 2 were to reach all these records, it would tend to engulf other FOIA exemptions, rendering ineffective the limitations Congress placed on their application. Exemption 7, for example, shields records compiled for law enforcement purposes, but only if one of six specified criteria is met. §552(b)(7). Yet on the Government’s view, an agency could bypass these restrictions by invoking Exemption 2 whenever law enforcement records guide personnel in performing their duties. Indeed, an agency could use Exemption 2 as an all-purpose back-up provision to withhold sensitive records that do not fall within any of FOIA’s more targeted exemptions.[Footnote 9]

Interpreted in this way, Exemption 2—call it “Super 2” now—would extend, rather than narrow, the APA’s former exemption for records relating to the “internal management of an agency.” 5 U. S. C. §1002 (1964 ed.). We doubt that even the “internal management” provision, which Congress thought allowed too much withholding, see supra, at 2, would have protected all information that guides employees in the discharge of their duties, including the explosives data and maps in this case. And perhaps needless to say, this reading of Exemption 2 violates the rule favoring narrow construction of FOIA exemptions. See, e.g., Abramson, 456 U. S., at 630; Rose, 425 U. S., at 361. Super 2 in fact has no basis in the text, context, or purpose of FOIA, and we accordingly reject it:chanrobles.com-red

V

Although we cannot interpret Exemption 2 as the Government proposes, we recognize the strength of the Navy’s interest in protecting the ESQD data and maps and other similar information. The Government has informed us that “[p]ublicly disclosing the [ESQD] information would significantly risk undermining the Navy’s ability to safely and securely store military ordnance,” Brief for Respondent 47, and we have no reason to doubt that representation. The Ninth Circuit similarly cautioned that disclosure of this information could be used to “wrea[k] havoc” and “make catastrophe more likely.” 575 F. 3d, at 971. Concerns of this kind—a sense that certain sensitive information should be exempt from disclosure—in part led the Crooker court to formulate the High 2 standard. See 670 F. 2d, at 1074 (contending that “common sense” supported the High 2 interpretation because Congress would not have wanted FOIA to “undermin[e] … the effectiveness of law enforcement agencies”). And we acknowledge that our decision today upsets three decades of agency practice relying on Crooker, and therefore may force considerable adjustments:chanrobles.com-red

We also note, however, that the Government has other tools at hand to shield national security information and other sensitive materials. Most notably, Exemption 1 of FOIA prevents access to classified documents. §552(b)(1); see 575 F. 3d, at 980 (W. Fletcher, J., dissenting) (Exemption 1 is “specifically designed to allow government agencies to withhold information that might jeopardize our national security”). The Government generally may classify material even after receiving a FOIA request, see Exec. Order No. 13526, §1.7(d), 75 Fed. Reg. 711 (2009); an agency therefore may wait until that time to decide whether the dangers of disclosure outweigh the costs of classification. See Tr. of Oral Arg. 29–30. Exemption 3 also may mitigate the Government’s security concerns. That provision applies to records that any other statute exempts from disclosure, §552(b)(3), thus offering Congress an established, streamlined method to authorize the withholding of specific records that FOIA would not otherwise protect. And Exemption 7, as already noted, protects “information compiled for law enforcement purposes” that meets one of six criteria, including if its release “could reasonably be expected to endanger the life or physical safety of any individual.” §552(b)(7)(F). The Navy argued below that the ESQD data and maps fall within Exemption 7(F), see n. 3, supra, and that claim remains open for the Ninth Circuit to address on remand:chanrobles.com-red

If these or other exemptions do not cover records whose release would threaten the Nation’s vital interests, the Government may of course seek relief from Congress. See Tr. of Oral Arg. 48. All we hold today is that Congress has not enacted the FOIA exemption the Government desires. We leave to Congress, as is appropriate, the question whether it should do so:chanrobles.com-red

VI

Exemption 2, consistent with the plain meaning of the term “personnel rules and practices,” encompasses only records relating to issues of employee relations and human resources. The explosives maps and data requested here do not qualify for withholding under that exemption. We therefore reverse the judgment of the Court of Appeals and remand the case for further proceedings consistent with this opinion:chanrobles.com-red

It is so ordered.

Footnote 1

The court adopted the “predominantly internal” standard as a way of implementing the exemption’s requirement that materials “relat[e] solely to” an agency’s internal personnel rules and practices. The word “solely,” the court reasoned, “has to be given the construction, consonant with reasonableness, of ‘predominantly’ ” because otherwise “solely” would conflict with the expansive term “related.” 670 F. 2d, at 1056 (some internal quotation marks omitted).

Footnote 2

Three other Courts of Appeals had previously taken a narrower view of Exemption 2’s scope, consistent with the interpretation adopted in Rose. See Cox v. Department of Justice, 576 F. 2d 1302, 1309–1310 (CA8 1978) (concluding that Exemption 2 covers only an agency’s internal “housekeeping matters” (internal quotation marks omitted)); Stokes v. Brennan, 476 F. 2d 699, 703 (CA5 1973) (holding that Exemption 2 “must not be read so broadly as to exempt” an Occupational Safety and Health Administration manual for training compliance officers); Hawkes v. IRS, 467 F. 2d 787, 797 (CA6 1972) (“[T]he internal practices and policies referred to in [Exemption 2] relate only to … employee-employer type concerns”). These Circuits have never revised their understandings of the exemption. See infra, at 13, n. 7.

Footnote 3

The Navy also invoked Exemption 7(F), which applies to “records or information compiled for law enforcement purposes, but only to the extent that the production of such … records … could reasonably be expected to endanger the life or physical safety of any individual.” 5 U. S. C. §552(b)(7)(F). The courts below did not decide whether the Navy could withhold the ESQD data under that exemption. 575 F. 3d 959, 971, n. 8 (CA9 2009); No. CV–06–01301 (WD Wash., Oct. 30, 2007), App. to Pet. for Cert. 4, 25, 2007 WL 3228049, *8.

Footnote 4

Government records also must satisfy the other requirements of Exemption 2 to be exempt from disclosure. Information must “relat[e] solely”—meaning, as usual, “exclusively or only,” Random House 1354 —to the agency’s “personnel rules and practices.” And the information must be “internal”; that is, the agency must typically keep the records to itself for its own use. See Webster’s 1180 (“internal” means “existing or situated within the limits … of something”). An agency’s human resources documents will often meet these conditions.

Footnote 5

The dissent would reject this longstanding rule of construction in favor of an approach asking courts “to turn Congress’ public information objectives into workable agency practice.” Post, at 8–9 (opinion of Breyer, J.). But nothing in FOIA either explicitly or implicitly grants courts discretion to expand (or contract) an exemption on this basis. In enacting FOIA, Congress struck the balance it thought right—generally favoring disclosure, subject only to a handful of specified exemptions—and did so across the length and breadth of the Federal Government. See, e.g., John Doe Agency v. John Doe Corp., 493 U. S. 146, 152–153 (1989). The judicial role is to enforce that congressionally determined balance rather than, as the dissent suggests, post, at 4–6, to assess case by case, department by department, and task by task whether disclosure interferes with good government.

Footnote 6

We are perplexed that the dissent takes seriously Crooker’s notion that the reports are “reconcilable.” Post, at 4. To strip the matter to its essentials, the House Report says: “Exemption 2 means A, but not B.” The Senate Report says: “Exemption 2 means B.” That is the very definition of “irreconcilable.”

Footnote 7

The dissent’s view that “two of th[ese] Circuits [have] not adher[ed] to their early positions” is incorrect. Post, at 2. In Abraham & Rose, P.L.C. v. United States, cited by the dissent, the Sixth Circuit rejected the Government’s claim that Exemption 2 shielded records of federal tax lien filings. 138 F. 3d 1075, 1082 (1998). The court nowhere discussed the High 2 versus Low 2 question at issue here. Its only reference to Crooker concerned the part of that decision interpreting “solely” to mean “predominantly.” See 138 F.3d, at 1080; see also n. 1, supra. Subsequently, the Sixth Circuit once again held, in Rugiero v. Department of Justice, that Exemption 2 applies to “routine matters of merely internal significance.” 257 F. 3d 534, 549 (2001). In Sladek v. Bensinger, which the dissent also cites, the Fifth Circuit insisted that the Government disclose a Drug Enforcement Administration agent’s manual because it “is not the type of trivial rule, such as allocation of parking facilities, that is covered by Exemption 2.” 605 F. 2d 899, 902 (1979). In confirming this Low 2 interpretation of the statute, the court acknowledged that another Circuit had embraced the High 2 standard. The court, however, declined to consider this alternative interpretation because it would not have changed the case’s outcome. See ibid. Finally, the Eighth Circuit’s last word on Exemption 2 is clear, and the dissent does not say otherwise. The exemption, according to that most recent Eighth Circuit decision, applies “only [to an agency’s] housekeeping matters.” Cox, 576 F. 2d, at 1309–1310 (internal quotation marks omitted). The dissent is surely right to say, post at 2, that Crooker “has guided nearly every FOIA case decided over the last 30 years” in Circuits applying Crooker; but that statement does not hold in the Circuits using the Low 2 approach.

Footnote 8

Notably, even those courts approving Crooker have disagreed about how to apply High 2. Fault lines include whether the risk of circumvention must be significant, see, e.g., Hidalgo v. FBI, 541 F. Supp. 2d 250, 253 (DC 2008); Pet. for Cert. 15–16; whether courts should consider the public interest in disclosure when calculating that risk, see, e.g., Department of Justice, Guide to the Freedom of Information Act, p. 185 (2009); and whether an agency must regulate the person or entity threatening circumvention; compare, e.g., 575 F. 3d, at 971, with, e.g., id., at 978 (W. Fletcher, J., dissenting). The disagreement is not surprising. Because High 2 is nowhere evident in the statute, courts lack the normal guideposts for ascertaining its coverage.

Footnote 9

The dissent asserts that “30 years of experience” with a more expansive interpretation of the exemption suggests no “seriou[s] interfere[nce] with … FOIA’s informational objectives.” Post, at 6. But those objectives suffer any time an agency denies a FOIA request based on an improper interpretation of the statute. To give just one example, the U. S. Forest Service has wrongly invoked Exemption 2 on multiple occasions to withhold information about (of all things) bird nesting sites. See Audubon Society v. Forest Serv., 104 F. 3d 1201, 1203 (CA10 1997); Maricopa Audubon Soc. v. Forest Serv., 108 F. 3d 1082, 1084 (CA9 1997). And recent statistics raise a concern that federal agencies may too readily use Exemption 2 to refuse disclosure. According to amicus Public Citizen, “while reliance on exemptions overall rose 83% from 1998 to 2006, reliance on Exemption 2 rose 344% during that same time period.” Brief for Public Citizen et al. as Amici Curiae 24. In 2009 alone, federal departments cited Exemption 2 more than 72,000 times to prevent access to records. See Brief for Allied Daily Newspapers of Washington et al. as Amici Curiae 3. We do not doubt that many of these FOIA denials were appropriate. But we are unable to accept the dissent’s unsupported declaration that a sweeping construction of Exemption 2 has not interfered with Congress’s goal of broad disclosure.