Reports of objects in the sky that observers could not identify. US government bodies have investigated them since the late 1940s and found that most cases they could resolve were ordinary objects; some military reports remain officially unexplained. Claims that the government holds non-human craft have been made under oath but were not substantiated by the Pentagon’s 2024 historical review.
By the Project Strange team · Not yet reviewed line by line · 18 sources
On this page
At a glance
- Also known as
- UFO · UAP · Unidentified flying object · Unidentified aerial phenomena · Unidentified anomalous phenomena · Flying saucer
- Subject
- Reported sightings · Historical events
- Earliest account cited here
- 24 June 1947 — Kenneth Arnold’s report of nine fast-moving objects near Mount Rainier, Washington[1]
- Material available
- Witness accounts, including testimony under oath · Official reports and record searches · Military infrared video released by the Department of Defense · Archival photographs
- Sourcing
- 18 sources listed · 11 from US government sites · 14 cited inline. Not yet reviewed line by line.
Background
BackgroundThe modern wave of reports is often dated to 24 June 1947, when private pilot Kenneth Arnold reported nine fast-moving objects near Mount Rainier, Washington. His account is preserved in the Air Force’s Project Blue Book case files.[1]
In July 1947 the Army Air Forces announced that a "flying disc" had been recovered near Roswell, New Mexico; officials soon identified the material as a radar-tracking balloon.[2] A 1995 search by the Government Accountability Office found that some Roswell Army Air Field records, including outgoing messages from October 1946 to December 1949, had been destroyed, with no record of who destroyed them or on what authority.[2] The Air Force concluded in 1994 that the debris came from Project Mogul, a balloon-borne research project, and in 1997 that later accounts of alien bodies most likely drew on anthropomorphic test dummies dropped from high-altitude balloons and on accidents in 1956 and 1959.[3]
The Air Force collected reports through Project Blue Book until it closed in 1969: 12,618 sightings, of which 701 remained "unidentified". It concluded that none indicated a threat to national security, technology beyond present-day science, or extraterrestrial vehicles.[4]
In December 2017 The New York Times reported that the Pentagon had run a little-known UFO research effort, the Advanced Aerospace Threat Identification Program, from 2007, with about $22 million in funding; the Pentagon said it had ended in 2012.[5] On 27 April 2020 the Department of Defense authorised the release of three Navy videos (one from November 2004, two from January 2015) that had already circulated after unauthorised releases, stating that the phenomena in them "remain characterized as unidentified".[6]
In June 2021 the Office of the Director of National Intelligence reviewed 144 reports from US government sources made between 2004 and 2021. It identified one with high confidence, a large deflating balloon, and said it lacked the information to attribute the rest.[7] In July 2023 a House Oversight subcommittee heard sworn testimony from former intelligence officer David Grusch, retired Navy Commander David Fravor and former Navy pilot Ryan Graves.[8] In March 2024 the All-domain Anomaly Resolution Office (AARO) reported finding no verifiable evidence that the US government or private industry had ever had access to, or reverse-engineered, extraterrestrial technology.[9]
Timeline
Dated events from the sources cited.
24 Jun 1947 Witness claim
Kenneth Arnold reports nine objects near Mount Rainier, Washington.[1]
Jul 1947 Documented
A "flying disc" recovery is announced at Roswell, then identified as a radar-tracking balloon.[2]
17 Dec 1969 Documented
The Secretary of the Air Force announces the end of Project Blue Book.[4]
28 Jul 1995 Documented
GAO reports on its search for Roswell records.[2]
1997 Documented
The Air Force publishes The Roswell Report: Case Closed.[3]
Nov 2004 Witness claim
Navy aviators from USS Nimitz report the “Tic Tac” object off southern California.[10]
16 Dec 2017 Documented
The New York Times reports the Pentagon’s UFO research program.[5]
27 Apr 2020 Documented
The Department of Defense authorises release of three Navy videos.[6]
25 Jun 2021 Documented
ODNI publishes its preliminary assessment of 144 reports.[7]
26 Jul 2023 Documented
House Oversight subcommittee hearing with Grusch, Fravor and Graves.[8]
Mar 2024 Documented
AARO publishes Volume I of its historical record report.[9]
What witnesses describe
Witness claimsFeatures that recur in accounts. These are claims, not established facts.
- Lights or objects that appear to hover, then move away very quickly
- Shapes described as discs, spheres, triangles or elongated “tic tac” forms
- No visible wings, exhaust or means of propulsion
- Sudden changes of direction that witnesses say no aircraft could make
- Detection on radar or infrared sensors as well as by eye, in some military reports
Notable cases
Each case is labelled by the kind of account it rests on.
1947Roswell, New MexicoDocumented
The Roswell incident
In July 1947 Roswell Army Air Field announced it had recovered a "flying disc"; within a day officials described the material as a weather or radar-tracking balloon. Decades later, witness accounts of an alien crash and bodies made Roswell the best-known UFO case.[2]
Read the full accountHide the full account
The GAO located only two government records from 1947 about the event: the 509th Bomb Group’s history for July 1947, which says the "flying disc" was later determined to be a radar-tracking balloon, and an FBI teletype of 8 July 1947 describing an object "resembling a high-altitude weather balloon with a radar reflector".[2]
Interest revived in the late 1970s, when researchers interviewed people who had been at or near the base, including intelligence officer Jesse Marcel, who said the debris was unlike a balloon. Other later accounts described bodies and a secret recovery.[11] These are recollections given decades after the event.
The Air Force’s 1997 report argued that activities spread over many years — balloon tests with anthropomorphic dummies in the 1950s, a 1956 KC-97 crash that killed 11 airmen and a 1959 balloon accident — had been merged in memory into a few days in July 1947.[3]
Disputed or contrary evidence
UFO researchers reject the Air Force’s explanations, pointing to the dummy drops beginning years after 1947. The GAO could not say who destroyed some Roswell base records or why.[2],[3]
Material: 1947 unit history and FBI teletype · GAO record search (1995) · Air Force reports (1994, 1997) · Later witness interviews
2004Pacific Ocean, off southern CaliforniaWitness claim
USS Nimitz “Tic Tac” encounter
In November 2004, Navy pilots from the USS Nimitz carrier group reported a white, wingless "Tic Tac" shaped object over the ocean that, they said, outmanoeuvred their F/A-18F fighters. An infrared video from the same period is one of three the Pentagon released in 2020.[10],[6]
Read the full accountHide the full account
In his written statement to Congress in 2023, Commander David Fravor said that controllers on the cruiser USS Princeton had for two weeks been tracking objects that descended rapidly from above 80,000 feet, and that his training flight was redirected to investigate. He described a small white object with no rotors, wings or visible flight controls moving abruptly above a patch of disturbed water.[10]
Fravor said the object climbed to meet his aircraft and then "rapidly accelerated and disappeared" as he closed on it, and that controllers then reported it on radar at the flight’s pre-arranged holding point roughly 60 miles away, less than a minute later. He wrote that it was "far superior" to anything the US had then or has now.[10]
Fravor said a crew that launched after his flight recorded the roughly 90-second infrared video. The Department of Defense later authorised its release with two 2015 videos, saying the phenomena "remain characterized as unidentified".[10],[6]
Disputed or contrary evidence
The account of the object’s speed and the radar track comes from the pilots’ testimony; the radar data has not been released. The Pentagon has not identified the object.[6]
Material: Pilot testimony (including 2023 written statement to Congress) · Navy infrared video released by the Department of Defense
2023Washington, DCDocumented
Congressional hearing on UAPs
On 26 July 2023 the House Oversight Subcommittee on National Security, the Border, and Foreign Affairs took sworn testimony from David Grusch, David Fravor and Ryan Graves. Grusch said he had been told of a decades-long programme to retrieve and reverse-engineer crashed craft; AARO later reported no verifiable evidence for such a programme.[8],[9]
Read the full accountHide the full account
Grusch, a former intelligence officer who served on the Pentagon’s UAP Task Force, said in his statement that he became a whistleblower through an "Urgent Concern" filing with the Intelligence Community Inspector General. He said he was informed of "a multi-decade UAP crash retrieval and reverse engineering program" but denied access to it, and that his testimony was based on information from others: "I am speaking to the facts as I have been told them."[12]
Former Navy pilot Ryan Graves described an incident in 2014 in Warning Area W-72 off Virginia Beach in which a pilot in his squadron reported "a dark gray cube inside of a clear sphere", and urged better reporting channels for military and commercial pilots.[13] Fravor repeated his account of the 2004 Nimitz encounter and called for congressional oversight of any programmes holding such technology.[10]
Under questioning, Grusch said that "biologics came with some of these recoveries" and that they were "nonhuman" — "the assessment of people with direct knowledge on the program I talked to". Asked whether people had been harmed to conceal the programme, he said "Yes, personally", and that he knew of colleagues who "got physically injured". He repeatedly said the supporting details could be discussed only in a classified setting.[14]
Disputed or contrary evidence
In its March 2024 historical review, AARO said it found no verifiable evidence that the US government or private companies had access to or reverse-engineered extraterrestrial technology, and that named programmes either did not exist or were unrelated national-security programmes.[9]
Material: Written statements and hearing record · AARO Historical Record Report, Volume I (2024)
Images
Photos often cited in connection with this subject. Inclusion doesn't mean they are authentic; many are disputed.
Archival photograph · cited as evidence; authenticity not established

One of two photographs Paul Trent said he took of an object near McMinnville, Oregon, in 1950. What it shows is disputed.
Credit: Paul Trent · Licence: Public domain (per Wikimedia Commons)
Image sourceExplanations
InterpretationGrouped by the kind of explanation, not ranked by likelihood.
Conventional explanations
Known animals, natural processes, perception, memory, or hoaxes. These rely on things that are well established; whether one fits a particular case depends on the case.
- Misidentified ordinary objects and effects. ODNI’s 2021 assessment expects resolved cases to fall into five groups: airborne clutter such as balloons and birds, natural atmospheric phenomena, US government or industry development programmes, foreign adversary systems, and "other".[7] Project Blue Book and AARO both concluded that most sightings they examined were ordinary objects or misidentifications.[4],[9]
Unconfirmed natural or human explanations
Would require an undiscovered species, an unrecognised natural effect, or secret human activity. Possible in principle, but not demonstrated.
- Classified human technology — secret aircraft or sensors not publicly acknowledged. ODNI lists government and foreign programmes among its categories; no specific case has been publicly attributed this way.[7]
- Unrecognised natural phenomena, such as large-scale plasma effects similar to ball lightning.
Paranormal and speculative ideas
Depend on entities, forces or physics that no evidence has established.
References
Numbered as cited in the text; sources not cited inline are listed afterwards as background reading.
- 1.Project Blue Book: The Kenneth Arnold UFO Sighting, Mt. Rainier, Washington, June 24, 1947 (case file)The Black Vault (copy of US Air Force records)
- 2.Government Records: Results of a Search for Records Concerning the 1947 Crash Near Roswell, New Mexico (GAO/NSIAD-95-187)US General Accounting Office · 28 July 1995
- 3.The Roswell Report: Case ClosedJames McAndrew · Headquarters, United States Air Force (Project Gutenberg edition) · 1997
- 4.Project BLUE BOOK – Unidentified Flying ObjectsUS National Archives (reproducing a 1985 Air Force fact sheet)
- 5.Glowing Auras and ‘Black Money’: The Pentagon’s Mysterious U.F.O. ProgramHelene Cooper, Ralph Blumenthal and Leslie Kean · The New York Times · 16 December 2017
- 6.Statement by the Department of Defense on the Release of Historical Navy VideosUS Department of Defense · 27 April 2020
- 7.Preliminary Assessment: Unidentified Aerial PhenomenaOffice of the Director of National Intelligence · 25 June 2021
- 8.Unidentified Anomalous Phenomena: Implications on National Security, Public Safety, and Government Transparency (hearing)House Committee on Oversight and Accountability · 26 July 2023
- 9.Report on the Historical Record of U.S. Government Involvement with Unidentified Anomalous Phenomena (UAP), Volume IAll-domain Anomaly Resolution Office, US Department of Defense · March 2024
- 10.David Fravor Statement for the House Oversight CommitteeHouse Committee on Oversight and Accountability · 26 July 2023
- 11.Roswell incidentWikipedia
- 12.Opening and closing statements of David GruschHouse Committee on Oversight and Accountability · 26 July 2023
- 13.Testimony of Ryan GravesHouse Committee on Oversight and Accountability · 26 July 2023
- 14.Unidentified Anomalous Phenomena: Implications on National Security, Public Safety, and Government Transparency — hearing transcript (Serial No. 118-53)US Government Publishing Office · 26 July 2023
- 15.Unidentified flying objectWikipedia
- 16.Pentagon UFO videosWikipedia
- 17.David Grusch UFO whistleblower claimsWikipedia
- 18.All-domain Anomaly Resolution Office (AARO)US Department of Defense
Known gaps
- Grusch’s statements about non-human biologics and injuries are quoted from the official hearing record; he did not present evidence for them in open session.
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Suggest an editCommunity reports
Top-voted reports from Project Strange members in the UFOs & UAPs category. These are first-hand accounts, not verified events.
Silent Triangle Over the M8 Motorway — Three Witnesses
I was driving westbound on the M8 near Bathgate at around 11:40 PM when my passenger grabbed my arm and told me to look up. A massive triangular craft — completely silent — was…
- Location
- Bathgate, West Lothian, Scotland
- Date of event
- Happened Nov 14, 2024