Collections
Anomaly Index does not draw from the open internet at large. Every incident traces back to one or more named collections of official records, listed here along with an honest account of how much of the index each one currently accounts for.
Anomaly Index currently indexes 25 incidents, cited to 52 source records. Of those sources, 36 are Tier A (primary government or academic material), 11 are Tier B (credible secondary reporting used for context), and 5 are Tier C (discovery and context material that cannot by itself qualify a case). International expansion happens one country at a time, and only when a stable official collection can be documented — the three international collections below reflect that, one government at a time.
United States
Project Blue Book and predecessor U.S. Air Force records
Held by: National Archives and Records Administration (NARA)
The U.S. Air Force's public UFO investigation program, active from 1947 to 1969, and the records NARA now holds from it and its predecessors. This is the largest single collection currently represented — 5 of the 52 cited sources, feeding 7 of the 25 indexed incidents, including the 1947 Kenneth Arnold sighting, the 1948 Mantell intercept, the 1952 Washington National Airport radar and visual sightings, the 1956 Lakenheath-Bentwaters radar-visual events, the 1957 Levelland and RB-47 cases, and the 1964 Socorro sighting. Blue Book's case files are large; what's indexed here is the subset that also meets the site's inclusion criteria, not the full archive.
Condon Report (University of Colorado UFO Project, 1966-1969)
Held by: University of Colorado, under U.S. Air Force contract
The federally funded scientific review that led to Project Blue Book's closure. It reassessed a number of previously investigated cases rather than opening new ones, which is how it's used here: 1 source, cited as an evaluative cross-reference on 4 incidents that predate it, including Lakenheath-Bentwaters, McMinnville, and the RB-47 encounter.
AARO public case material and reports
Held by: All-domain Anomaly Resolution Office, U.S. Department of Defense
The Department of Defense office responsible for resolving unidentified anomalous phenomena reports, established in 2022. Its published case resolutions and its 2024 historical record report are the current U.S. government's active word on several well-known Navy-era cases. 3 sources, feeding 3 incidents — the USS Nimitz "Tic Tac" encounter and the GIMBAL and GOFAST video cases.
DoD Navy UAP video releases (2020)
Held by: U.S. Department of Defense
The Department of Defense's 2020 official release confirming and publishing three previously leaked Navy-captured videos. 1 source, feeding the same 3 Navy incidents as the AARO collection above — the video release and the later AARO case resolutions document the same events from different points in the process.
Congressional hearings and reports
Held by: U.S. House and Senate committees
Public hearing transcripts and committee reports on UAP, including a 2022 House hearing, a 2023 House hearing transcript on the Nimitz encounter, and a 2023 Senate Appropriations subcommittee hearing on the 2023 high-altitude balloon transit and shootdown. 3 sources, feeding 3 incidents.
Phoenix Lights FOIA records
Held by: U.S. Air Force (Davis-Monthan Air Force Base and Luke Air Force Base)
FOIA-released records bearing on the 1997 Phoenix Lights mass sighting, released in 1997 and 2013. 2 sources, feeding the single 1997 Phoenix Lights incident.
FAA Japan Air Lines Flight 1628 case file
Held by: Federal Aviation Administration, U.S. Department of Transportation
The FAA's official case file on the 1986 encounter reported by the crew of Japan Air Lines Flight 1628 over Alaska. 1 source, feeding the single incident it documents.
ODNI preliminary assessment (2021)
Held by: Office of the Director of National Intelligence
The 2021 unclassified preliminary assessment on unidentified aerial phenomena, prepared for Congress. 1 source, cited on the 2019 Channel Islands multi-destroyer drone swarm encounters.
International
UK National Archives — Rendlesham Forest Ministry of Defence files
Held by: The National Archives (UK) / Ministry of Defence
Declassified MOD files (record series DEFE 24) and the contemporaneous Halt memo concerning the December 1980 events near RAF Woodbridge and RAF Bentwaters. 2 sources, feeding the single Rendlesham Forest incident.
CEFAA (Chile)
Held by: Comité de Estudios de Fenómenos Aéreos Anómalos, part of the Chilean civil aviation authority
Chile's official government committee for investigating anomalous aerial phenomena, and one of the few standing state UAP-investigation bodies in the world. 2 sources, feeding the single 2014 Chilean Navy helicopter infrared-recording incident currently indexed.
Belgian Air Force — 1990 wave records
Held by: Belgian Air Staff (État-Major de la Force Aérienne Belge)
The official Air Staff chronology and press-conference findings on the 30–31 March 1990 F-16 scramble and radar-lock events, part of the wider 1989–1990 Belgian sighting wave. 1 source, feeding the single incident it documents. Worth stating plainly: no live Belgian government hosting of this document could be located, and the only accessible copies today are preserved researcher mirrors of the original Air Staff report — the document itself is official, but its provenance chain runs through a third-party archive rather than a government web page. The incident record notes this explicitly.
Individually sourced incidents
Six of the 25 currently indexed incidents draw only on individual government or academic records that haven't yet been grouped into a named collection above: the 1942 Battle of Los Angeles anti-aircraft barrage (National Archives record group 338, the FDR Presidential Library, and U.S. Army Air Forces official history), the 1944 415th Night Fighter Squadron light reports (National Archives record group 18), the 1947 Roswell debris recovery (a General Accounting Office report and a U.S. Air Force report, both 1995), the 1967 Malmstrom Air Force Base Echo Flight missile shutdown (a Strategic Missile Wing unit history), the 1976 Tehran F-4 intercept events (a Defense Intelligence Agency report), and the recurring Hessdalen Valley light phenomena in Norway (peer-reviewed papers in the Journal of Scientific Exploration). These are real Tier A sources, just not yet organized into a formally named collection the way Project Blue Book or AARO's material is. As more official collections are processed and documented, some of these may be folded into new collection entries on this page.