This аppeal is taken from a district court judgment directing the United States Department of the Army (“Army”) to disclose to the Providence Journal Company (“Journal”), pursuant to a Freedom of Information Act (“FOIA”) request, numerous documents relating to an internal criminal investigation into allegations against six officers of the Rhode Island National Guard (“RING”). The Army contends that the documents are protected from compelled disclosure under three FOIA exemptions.
I
BACKGROUND
During 1988, the Office of the Inspector General of the Army (“IG”) received four anonymous letters implicating six RING officers in alleged misconduct punishable either by internal disciplinary action or by court-martial under the Uniform Code of Military Justice. See 10 U.S.C. §§ 801-946 (1985 & Supp.1992). The Army Vice Chief of Staff (“VCOS”) directed the IG to investigate the charges against two “senior” officers and to submit a report to the Army officer (“Army command”) invested with the authority to determine whether either disciplinary action or court-martial was warranted. The allegations against the four junior officers were referred to the National Guard Bureau.
In order to foster cooperation and curb possible fears of reprisal or harassment, the IG’s office, which has no subpoena power, promises confidentiality — as to both witness identity and statement content— “to the maximum extent possible, particularly when it is specifically requested.” Department of Army Regulation (“DAR”) 20-1, ¶ l-15a. The IG interviewed twenty-seven witnesses in the course of the investigation. Three witnesses waived their right to confidentiality. In December 1989, the IG submitted a report (“IG Report”), which was “approved” by the Army VCOS. Army regulations provide that “approval” of an IG report does not connote official *556 Army adoption of its findings or recommendations. DAR 20-1, 11 3-lc. The record reveals no further Army action on the IG Report.
In due course, the Journal and one of its reporters filed an FOIA request for “all documents pertaining to the Inspector General’s investigation of the Rhode Island National Guard.”
See
5 U.S.C. § 552 (1990). The Army released a redacted version of the IG Report, withholding several exhibits in reliance on four FOIA exemptions.
See id.
§§ 552(b)(5) (exemption for predecisional intra-agency memoranda), (6), (7)(C) (exemptions to safeguard against unwarranted invasions of privacy), and (7)(D) (exemption for information provided by a “confidential source”). Following an unsuccessful administrative appeal to the Army General Counsel, the Journal filed suit in the United States District Court for the District of Rhode Island to compel disclosure of the unredacted documents pursuant to 5 U.S.C. § 552(a)(4)(B). The parties filed cross-motions for summary judgment. The district court directed the Army to submit a so-called
Vaughn
Index,
see Vaughn v. Rosen,
A. IG Report
1 Identity of the six RING officers who were targets of the investigation [Exemptions 6 & 7(C)];
2,6 IG’s conclusions as to whether each allegation was substantiated or unsubstantiated [Exemption 5];
3,5 IG’s synopsis of each allegation and findings of fact [Exemptions 5 & 7(D)];
4 Statements provided by confidential and non-confidential witnesses [Exemptions 5 & 7(D)];
7 IG’s final recommendations regarding further disciplinary action [Exemption 5];
B. Full transcript of statement by Nonconfidential source [Exemptions 5 & 7(D)];
C-E. Internal memoranda and directives between Army VCOS and IG’s Office [Exemptions 6, 7(C) & 7(D)]; F-I. Four anonymous letters [Exemptions 6, 7(C) & 7(D)];
J. Travel vouchers [Exemptions 6, 7(C) & 7(D) l 1
Following an in camera inspection of the unredacted documents, the district court granted partial summary judgment and directed the Army to release the entire IG Report, excepting only the names (and other identifying information) of the confidential sources (Vaughn Index §§ A3, A4, AS) and the various intra-agency memoranda (Vaughn Index §§ C-E). 2
II
DISCUSSION
The FOIA was designed to expose the operations of federal agencies to public scrutiny without endangering efficient administration, as a means of deterring the development and application of a body of “secret law.”
See Department of Air Force v. Rose,
A. Exemption 5
With respect to the IG Report’s “subjective” evaluation of the evidence against the two senior RING officers, as well as the IG’s recommendations to the Army VCOS, the Army asserts a claim under Exemption 5 which prohibits compelled disclosure of “inter-agency or intra-agency memorandums or letters which would not be available by law to a party other than an agency in litigation with the agency.” 5 U.S.C. § 552(b)(5). Agency documents which would not be obtainable by a private litigant in an action against the agency under normal discovery rules
(e.g.,
attorney-client, work-product, executive privilege) are protected from disclosure under Exemption 5.
United States v. Weber Aircraft Corp.,
[I]t serves to assure that subordinates within an agency will feel free to provide the decisionmaker with their uninhibited opinions and recommendations without fear of later being subject to public ridicule or criticism; to protect against premature disclosure of proposed policies before they have been finally formulated or adopted; and to protect against confusing the issues and misleading the public by dissemination of documents suggesting reasons and rationales for a course of action which were not in fact the ultimate reasons for the agency’s action.
Coastal States Gas Corp. v. Department of Energy,
1. “Predecisional Document” Test
A document will be considered “predecisional” if the agency can- (i) pinpoint the specific agency decision to which the document correlates,
Paisley v. CIA,
The Journal argues nonetheless that Army command implicitly adopted the IG Report by its apparent failure to take any action within a reasonable time after issuance, thereby disentitling the IG’s recommendations to “predecisional” status under Exemption 5. The Journal contends that its “implied adoption” theory is necessary to prevent an agency’s use of its own inaction as an absolute shield from compelled FOIA disclosure of the results of any internal investigation. 4
The “implied adoption” theory is neither supported by the plain language of Exemption 5 nor the related caselaw,
5
and would disserve the recognized aims of Exemption 5. Express adoption of a predecisional document is a prerequisite to an agency waiver under Exemption 5.
See, e.g., Sears,
The proposed “implied adoption” rule would undermine Exemption 5 by inhibiting the free exchange of views within an agency. Agency advisors responding to supervisory directives might be less forthcoming with their advice lest their recommendations be exposed to public scrutiny in the event final agency action is not promptly taken.
See Access Reports v. Department of Justice,
Accordingly, we decline to depart from the established view that an agency may meet its burden of proof under the “predecisional document” test by demonstrating that the preparer was not the final decisionmaker and that the contents confirm that the document was originated to facilitate an identifiable final agency decision.
See Mobil Oil Corp. v. EPA,
2. “Deliberative Document” Test
A “predeсisional” document may still not “fall within the confines of Exemption 5 if it is not part of the ‘deliberative process.’ ”
Formaldehyde Inst. v. Department of Health and Human Servs., 889
F.2d 1118, 1121 (D.C.1989);
see also Access Reports,
the [IG’s] investigatory report was not a deliberative policy-making document. The investigation concerned factual allegations against high-ranking officials. This is not agency policy in the same vein as Mink, supra, where reports were prepared for the President on the advisability of underground nuclear testing.
If the [IG] report concerned broader issues—if it was a report of general recоmmendations on disciplining superior officers—the situation would be different. However, this report is factually specific; it does not reflect “agency give- and-take—of the deliberative process— by which the decision itself is made.”
Providence Journal v. Department of Army,
A predecisional document will qualify as “deliberative” provided it (i) formed an essential link in a specified consultative process, (ii) “reflect[s] the personal opinions of the writer rather than the policy of the agency,” and (iii) if released, would “inaccurately reflect or prematurely disclose the views of the agency.”
National Wildlife Fed’n v. Forest Serv.,
a. “Consultative Process”
We find no authority for the suggested distinction between “reports of general recommendations on disciplining superior officers” and “factual” reports prepared in the course of internal disciplinary investigations against particular individuals.
See, e.g., Renegotiation Bd.,
As Army command controls the agency decision whether Army personnel are to be disciplined for alleged misconduct, or prosecuted under the Uniform Code of Military Justice for alleged criminal activity, its deliberative task is no less an agency function than the formulation or promulgation of agency disciplinary policy. As with other discretionary prosecutorial decisions, many considerations contribute to the final determination by Army command, including the rank of the investigated officers, the seriousness of the allegations, the overall reliability of the evidence, the relative appropriateness of the available forms of remediation, and any special mitigating circumstances.
Cf. Senate of Puerto Rico,
b. “Essential” to Consultative Process
Neither can we agree that the primary function of the IG Report was to convey raw evidence or data discovered during the investigation and that the IG’s recommendations were peripheral or gratuitous.
Schell,
c. Premature Disclosure of IG’s “Personal Opinions”
Nor is the chilling effect on candid advice from agency subordinates, which Exemption 5 was designed to mitigate, significantly diminished merely by reason of the fact that the subordinates’ recommendations relate to the appropriateness of disciplinary action against particular individu-
*561
ais. A subordinate agency advisor may have
more
cause for concern about public disclosure of disciplinary recommendations involving high-level agency officials, since there may be a real or perceived risk of retaliation from a vindictive official who is the target of the advisor’s findings or recommendations.
Cf. Cooper,
Army command is not required to accept the IG’s recommendations. Indeed, command already may have exercised its prerogative to take no further action on these allegations, for reasons entirely unrelated to the grounds espoused in the IG Report. Accordingly, since public release of the recommendatory sections in the IG Report would either “inaccurately reflect or prematurely disclose the views of the agency,” the Army may not be required to reveal any information referenced in Vaughn Index §§ A2, A6, or A7. 8
d. “Inextricably Intertwined” Fact-Oriented Material
The Army contends that Vaughn Index §§ A3 and A5, conveying the IG’s conclusions as to the facts revealed by the evidence discovered during the investigation, should be exempt because the conclusions are so “inextricably intertwined” with the IG’s mental processes that their disclosure necessarily would reveal the substance of the IG’s recommendations.
See, e.g., Quarles v. Department of Navy,
The Exemption 5 analysis employs a rough-hewn dichotomy between opinion and fact: whereas the purely recommenda-tory provisions in a deliberative predeci-sional document are exempt from compelled disclosure, “memoranda consisting only of compiled factual material or purely factual material contained in deliberative memoranda and
severable from its context
would generally be available for discovery....”
Mink,
Even when requested material is found to be factual, the courts have held it exempt where they were convinced that disclosure “would expose an agency’s de-cisionmaking process in such a way as to discourage candid discussion within the agency and thereby undermine the agency’s ability to perform its functions.”
Quarles,
While mere selection of the evidence deemed
material
to an agency decision may not implicate Exemption 5,
10
disclosure of the IG’s findings of fact necessarily would reveal the opinion of the IG on the credibility and probity of the evidence relating to each allegation. Findings of fact arrived at in the personnel management context reflect a significant degree of subjectivity. Our review of these Vaughn-indexed documents discloses instances of conflicting and inconsistent witness statements. The findings of fact in the IG Report necessarily were premised on an assessment and resolution of the relative credibility of these statements, as well as subjective judgments as to the probity of other evidence developed during the investigation.
Cf. Playboy Enters., Inc. v. Department of Justice,
B. Exemption 7(D)
The Army claims that the statements provided by twenty-eight (twenty-four solicited witnesses and four anonymous informants) of its thirty-one sources (Vaughn Index §§ A4, F-I) are nonetheless protected under Exemption 7(D), which shields from compelled disclosure records and information compiled for law enforcement purposes,
but only to the extent that the[ir] production ...
could reasonably be expected to disclose the identity of a confidential source 12
and, in the case of a record or information compiled by criminal law enforcement authority in the course of a criminal investigation ... information furnished by a confidential source. (Emphasis added.)
Exemption 7 was intended to avert the “drying-up” of sources of information necessary to conduct criminal investigations.
Irons v. FBI,
Document confidentiality depends not on the contents but on the terms and circumstances under which the information was acquired by the agency.
See Irons I,
1. Statements Solicited from Confidential Sources (Vaughn Index § A4)
The district court found that twenty-four of the twenty-seven individuals from whom information was solicited by the IG qualified as “confidential” sources,
*564
since they acсepted express agency assurances of confidentiality; hence their
identities
were protected from disclosure under the first clause of Exemption 7(D). The district court nevertheless held that the
contents
of each statement solicited from these confidential sources must be disclosed because the information was not “furnished
only
by the confidential source.”
See Providence Journal,
Although we agree with the district court that the identities of the twenty-four confidential sources are exempt from disclosure under the first clause of Exemption 7(D), we cannot agree that the
contents
of their statements are not shielded from disclosure under the second clause. The district court ruling relied entirely on the word “only”—appearing in the second clause of Exemption 7(D)—which Congress deleted in 1986 for the explicit purpоse of clarifying the broad policy goals served by the second clause.
14
Irons I,
The Journal nevertheless urges af-firmance of the district court ruling, on the ground that the Army should be required to prove that each individual witness either (1) initiated the request for confidentiality, or (2) articulated a legitimate reason for invoking confidentiality respecting statement content after the IG made the initial tender of confidentiality. Absent some such prophylactic rule, the Journal argues, a federal agency could insulate itself from legitimate FOIA disclosure requests merely by offering confidentiality to all sources, whether or not required or requested by the source.
The Journal cites no authority for its proposed rule, and sound policy considerations counsel against it. Muzzling law enforcement agencies in order to deter tenders of confidentiality likely would risk “drying-up” the flow of information from many wary witnesses with valuable information, especially sources who might reasonably expect that an agency would extend an offer of confidentiality if it were an available option. Moreover, in circumstances where law enforcement officials solicit information pertaining to a criminal investigation,
see supra
note 13, absent evidence to the contrary the courts have inferred agency assurances of confidentiality notwithstanding agency silence.
See, e.g., Dow Jones,
A requirement that agency assurances of confidentiality be subjected to post hoc judicial evaluation as proposed by the Journal promises more mischief than benefit. The task of evaluating the “legitimacy” of confidentiality claims and assurances on a wit *565 ness-by-witness basis would not only be onerous but often fruitless. It would be rare that a source would be unable to advаnce some colorable basis for a confidentiality claim, given the subjective nature of witness concerns about possible retaliation. Perhaps more importantly, mere awareness by potential sources that the agency’s assurances of “content” confidentiality would be subject to second-guessing by the courts (advice with which fairness would seem to require that an agency provide its potential sources in advance) frequently would mean that only the unwary would be inclined to provide information in an internal criminal investigation.
We think it more fair and efficient that law enforcement agencies be allowed to continue to extend assurances of confidentiality to their sources, with the advice that confidentiality may be disclaimed. In this manner, unfettered agency control and manipulation of Exemption 7(D) protections can be minimized without jeopardizing valuable agency sources. As the procedure utilized by the Army met this standard, its twenty-four solicited statements are exempt from FOIA disclosure in their entirety undеr Exemption 7(D).
2. Unsolicited Anonymous Sources (Vaughn Index §§ F-I)
The district court found that the four anonymous letters were not protected from compelled disclosure by Exemption 7(D) as there was no evidence that the letters were sent under implied assurances of confidentiality. The court identified two reasons for its ruling: (1) the letters may have been written by non-military personnel unfamiliar with the "obscure Army regulations” assuring confidentiality, and (2) copies of the letters were made available to other “disciplinary” officials, including Army generals and the Governor.
Providence Journal,
Given the obvious import of the 1986 amendments to Exemption 7(D),
see supra
note 14, and the consequent easing of the law enforcement agency’s burden of proof, we think the Tenth Circuit has articulated a sound rationale for determining whether the unsolicited information from these anonymous sources was provided under an
implied
assumption of confidentiality.
See Johnson,
Most people would assume that the information they give to a criminal law enforcement official during a criminal investigation will be kept confidential. However, situations may arise where it is unreasonable to make this аssumption, and in the face of evidence to this effect in the record, a district court will not be precluded from so finding.
Id. at 1518.
Generally speaking, the circumstances in which these anonymous letters were submitted comport with a reasonable assumption of confidentiality on the part of the writers. Thus,
[i]t is unrealistic to assume that a majority of persons reporting to an agency what they believe to be illegal or improper acts are legally sophisticated. To the contrary, it is much more likely that they would not know the boundaries of the FOIA exemptions and, therefore, would not include in their initial communication to the agency an express request for confidentiality. They may be frightened, angry, or confused, and their immediate concerns do not include creating an evi-dentiary record to prove an assurance of confidentiality in anticipation of a potential FOIA request.
In cases involving unsolicited information from ostensibly confidential sources, the court should look to all factors ... [to determine] whether a request for confidentiality is implicit, i.e., thаt in light of the information and surrounding circumstances, the communication in all likelihood would not have been made if confidentiality had not been assured.
Brant,
Unlike Brant, which involved an identified unsolicited source, see id. at 1260-61, in the present ease the writers redacted their names. The Journal contends that the redaction of their names demonstrates the writers’ realization that the letters might be publicized, and their satisfaction that they had successfully excised all forms of identifying material. On the contrary, we believe that their determination to remain anonymous provides further reason for indulging the customary presumption that the information was provided under an implicit assurance of confidentiality.
Exemption 7(D) contains two
independent
safeguards against content disclosure. Under the first clause, there is to be no disclosure of information which would reveal the
identity
of the source. Under the much broader second clause, however, there is to be no disclosure of information offered in confidence, without regard to whether it would divulge the identity of the source.
See Irons II,
The congressional purpose underlying the blanket exemption in the second clause is readily apparent. Although even a
known
source may not want the
substance
of the information made public, sources who choose to clothe themselves in anonymity most likely do so because they do “not want to have to rely upon the agency’s or the courts’ judgment that disclosure will not reveal [their] identity (which is of course the basis for a separate exemption — the first clause of Exemption 7(D) ...).”
Shaw,
Second, we can ascribe no controlling significance to the fact that the authors of three of the anonymous letters (Vaughn Index §§ F, G, H) expressed their intention to provide copies to non-agency officials, such as the Governor of Rhode Island, who is vested with concurrent authority to pursue disciplinary action against RING personnel.
See
R.I.Gen.Laws § 30-2-1 (1982) (prescribing Governor’s statutory authority as commander-in-chief of RING). Assuming the writers carried through with their stated intention to send duplicate letters, there is nothing in the record to suggest that the writers could not reasonably have expected comparable assurances of confidentiality from these non-agency officials, or that these officials dealt with the letters in a manner which might arguably render the reasonableness of the writers’ expectations suspect.
See Brant,
Finally, two letters (Vaughn Index §§ F, I) contain explicit representations that the writers feared “reprisal” or “retribution” {e.g., loss of employment) in the event their statements were disclosed. See id. (court ought not dismiss as “a flight of fancy” an expressed fear of retaliation in unsolicited letter). Given the core function of Exemption 7(D), we believe that the flow of unsolicited information should not be jeopardized by risking exposure of the identities of sources through disclosure of the contents of their anonymous communications. We therefore conclude that all twenty-eight confidential source statements are protected from compelled disclosure by Exemption 7(D). The three remaining source statements, however, are not “confidential,” and therefore are not protected from compelled disclosure under Exemption 7(D). 16
C. Exemption 7(C)
Thе three “nonconfidential” source statements (Vaughn Index § A4) include explicit references to the names of the two senior RING officers. The district court did not distinguish between substantiated allegations and unsubstantiated allegations, but ordered disclosure of the names of the two senior RING officers because (1) as “high-ranking” agency officials with substantial supervisory authority, the officers enjoyed a diminished privacy interest, (2) the allegations of criminal conduct implicated their official duties, which would “shed light” on RING performance, and (3) there is a countervailing public interest in monitoring RING performance, both as concerns the conduct of the target officers and the adequacy and comprehensiveness of the IG’s internal investigation.
Providence Journal,
The Army did not apрeal the district court ruling compelling disclosure of the three nonconfidential source state *568 ments relating to the substantiated allegations, perhaps because the Army understood that “all or much of this material may be independently protected by exemptions 5 or 7(D).” Brief for Appellant at 20 n. 16 (emphasis added). As neither Exemption 5 nor Exemption 7(D) is availing, however, the Army must disclose, in their entirety, the statements of the three noncon-fidential sources which relate to substantiated allegations. 19 We confine the remainder of our discussion to the nonconfidential source statements relating to the “unsub stantiated” allegations against the two senior RING officers.
Under our Exemption 7(C) precedents, in order to determine whether disclosure might reasonably be expected to work an “unwarranted” invasion of privacy the court is required to
balance
the privacy interests of the targets of the criminal investigation against any public interest in the disclosure of their identities.
See New England Apple Council v. Donovan,
A private individual who becomes the target of a law enforcement agency investigation, and whose alleged criminal conduct in no way reflects on the
law enforcement agency’s performance,
has a significant interest in рreventing premature public disclosure of his or her identity under Exemption 7(C).
See Reporters Comm.,
‘One who serves his state or nation as a career public servant is not thereby stripped of every vestige of personal privacy, even with respect to the discharge of his official duties. Public identification ... could conceivably subject them to harassment and annoyance in the conduct of their official duties and in their private lives.’
New England Apple,
Public identification of the “targets of law enforcement investigations can subject those identified to embarrassment and potentially more serious reputational harm.”
SafeCard,
In the case of a low ranking agency official or employee, a rebuttable presumption may arise against compelled disclosure of allegations of misconduct which the agency investigation determines to have been “unsubstantiated,” but the case becomes more complicated if the target is an agency official of greater authority or importance. In particular, there may be a greater public interest in disclosure where the allegation — although determined unsubstantiated by the agency — may nevertheless be true, and may pose a serious threat to the public interest. Or an “unsubstantiated” allegation may bear upon a claim, supported by independent evidence, that the investigating agency actively engaged in the concealment of the target official’s misconduct or otherwise failed to perform its mission. These considerations lend themselves to no mechanical rule of disclosure or non-disclosure. Nor, on the other side of the Exemption 7(C) equation, can we prescribe a formula for measuring the impact of the privacy invasion resulting from disclosure. These and other relevant variables must be determined and weighed in light of the particular circumstances in each case.
With these general considerations in mind, we turn to the particular facts before us. It is true, as the Army suggests, that the Journal neither alleged nor attempted to prove a cover-up in the IG’s investigation. At the same time, we think the invasion of privacy wrought by disclosure in this case is unusually slight. The Army already has disclosed one of the two unsubstantiated allegations and the other is minimally invasive of privacy, containing as it does a rather blurred suggestion of possible impropriety. The unsubstantiated allegations are not of such an intimate nature that the disclosure of the target’s identity normally would be “unwarranted” even though the information might tangentially implicate the target’s performance of official duties, or the zeal or competence of the investigators.
See, e.g., New England Apple,
Ill
CONCLUSION
The Army voluntarily disclosed redacted versions of the statements of its nonconfi-dential sources, redacting more than the officers’ names in some instances. See Vaughn Index A, p. 11, ¶ 8. The Army shall be required to release an unredacted version of the source statements appearing in the IG Report at p. 8, 1117; p. 11, ¶ 8; p. 14, H 10; p. 15, 11 3; and p. 17, II 5. The Army nonetheless may redact any reference to persons (other than the two senior RING officers) who acted as confidential sources and are identified as such in any nonconfidential source statement. See, e.g., Vaughn Index A, p. 11, 11 8.
The district court judgment is modified in accordance herewith, and affirmed as modified; no costs.
Notes
.Throughout the opinion, relevant portions of the IG Report and exhibits are identified by reference to their Vaughn Index numbers. The Army did not appeal from the order to disclose, in their entirety, Vaughn Index B and J.
See Providence Journal Co.
v.
Department of Army,
. The Journal does not challenge the district court ruling relating to Vaughn Index C-E.
. Throughout the opinion, all citation references to agencies or departments are to United States agencies or departments, unless otherwise indicated.
. The Journal suggests also that the Army’s earlier "approval” of the IG Report, coupled with the apparent inaction, signified official Army "adoption" of the IG Report. Army Regulations provide, however, that "[w]hen an IG report is approved, conclusions and recommendations contained in the report do not constitute the directing authority’s decision nor an explanation of the decision unless specifically adopted as such
in writing
by the directing authority.” DAR 20-1, ¶ 3-lc (emphasis added);
cf. Niemeier v. Watergate Special Prosecution Force,
. The one decision cited in support of the theory,
Washington Post Co. v. Department of Air Force,
. The Army argues that the Journal cannot assert its "implied adoption” claim because it failed to request disclosure of documents describing any final agency action following "approval” of the IG Report. In our view, however, the initial Journal request, which sought “all documents pertaining to the Inspector General’s investigation of the Rhode Island National Guard," was broad enough to include any such written record of final action by the Army, if one exists.
See McGehee v. CIA,
.In contrast, express agency adoption represents a significant vindication of a subordinate advisor’s recommendation, posing little risk of retaliation or public embarrassment.
See, e.g., SafeCard Servs., Inc. v. SEC,
. None of the cases relied on by the Journal, or by the district court, supports a contrary result.
Weber Aircraft,
Adams v. United States,
. Even though the Army raised the issue before the district court,
see Providence Journal,
. In some cases, a predecisional distillation of material facts from a larger public record may reveal the final decisionmaker’s mental processes by enabling public scrutiny of the information
not
relied on in arriving at the final agency decision.
See, e.g., Russell,
. For instance, disclosure of a finding that a high-ranking officer did or did not engage in particular conduct reveals the IG’s judgment as to whether the allegation was substantiated by the evidence. Were such findings subject to compelled disclosure in these circumstances, forthright findings of fact by agency subordinates, based on disputed evidence, would be harder to come by. See American Fed’n, 441 *563 F.Supp. at 1313 (chilling effects of prospective disclosure are greatest in the case of an internal criminal investigation of agency personnel).
. The Journal seeks disclosure of the contents of the statements only, not the witnesses’ identities.
. The Journal does not dispute that the requested documents satisfy the threshold criterion under Exemption 7(D), namely that the records were compiled by a criminal law enforcement authority in the course of a criminal investigation.
See Curran,
. Prior to the 1986 amendment, § 552(b)(7)(D) exempted
investigatory records compiled for law enforcement purposes, but only to the extent that the production of such records would ... disclose the identity of a confidential source and, in the case of a record compiled by a criminal law еnforcement authority in the course of a criminal investigation, or by an agency conducting a lawful national security intelligence investigation, confidential information furnished only by the confidential source.
(Emphasis added.) The 1986 amendment eased the government’s burden of proof substantially. For the phrase "would ... disclose,” it substituted the phrase “could reasonably be expected to disclose,” and it deleted the word "only" in the final clause. See supra p. 563; see also Irons I,811 F.2d at 687 .
. The Journal acknowledges that the district court mistakenly relied on the unamended version of Exemption 7(D). It concedes as well that the district court’s finding that these twenty-four witnesses did receive express assurances of confidentiality is supportable.
. As the Army concedes, the statements provided by the three remaining sources, who expressly waived the IG's assurances of confidentiality, would in all likelihood not be protected from disclosure under Exemption 7(D). Exemption 7(D) itself does not indicate what effect a witness's waiver of assurances of confidentiality might have on the agency’s power to shield the statement from FOIA disсlosure. Nevertheless, since uncertainty about the precise scope of a waiver might "dry up” law enforcement sources, we consistently have refused to find an
implied
waiver where the subjective intent of the informant to relinquish confidentiality can be inferred only from ambiguous conduct, often occurring long after the informant provided the confidential information.
See Irons I,
. We need not decide whether the four junior RING officers’ names are protected from disclosure under Exemption 7(C). The four anonymous letters, which are exempt from disclosure in their entirety under Exemption 7(D), were the only sources of information about these officers. Furthermore, the allegations against these four officers were not referred to the IG’s Office for investigation, and form no part of the IG report.
.Exemption 6, the alternative "privacy” exemption asserted by the Army, protects "personnel and medical files and
similar files
the disclosure of which
would constitute
a
clearly
unwarranted invasion of personal privacy.” (Emphasis added.) Exemption 6 affords the Army far
less
protection against compelled disclosure than does Exemption 7(C). Exemption 6 requires proof that the requested documents come within the narrow definition of "similar files,” that the invasion of privacy would be
“clearly
unwarranted,” and that disclosure would
in fact
constitute an invasion of privacy.
Reporters Comm.,
. Even if the Army had pursued this line of argument on appeal, it is unlikely that the scope of FOIA protection would be broadened. To the extent that the RING officers lacked a sufficient privacy interest in witness statements relating to unsubstantiated, allegations, their privacy interest would surely diminish as to substantiated charges in which there presumably would be a heightened public interest.
