Knowledge Tree
Air Force
Also known as: U.S. Air Force, United States Air Force, USAF, US Air Force
Facts (60)
Sources
Unidentified flying object - Wikipedia en.wikipedia.org 21 facts
claimProject Sign was a U.S. Air Force investigation into UFOs conducted by the Air Materiel Command at Wright Field, serving as a precursor to Project Grudge in 1948.
claimProject Twinkle was a brief U.S. Army/Air Force investigation into green fireballs that began in December 1949.
claimProject Sign was created by the Air Force at the end of 1947 and was one of the earliest government studies to reach a secret extraterrestrial conclusion.
accountOn September 27, 2010, former U.S. Air Force personnel held a press conference at the National Press Club in Washington, D.C., where they alleged that UFOs had interfered with nuclear missiles at U.S. facilities.
accountThe USAF Rendlesham Forest incident in England, which occurred in December 1980, is a well-known example of a UFO case involving claims of physical traces.
claimThe Battelle Memorial Institute conducted the Project Blue Book Special Report No. 14, a statistical study of UFO reports for the U.S. Air Force, between 1951 and 1954.
referenceThe Black Vault is a private website that maintains an archive of several thousand U.S. government UFO-related documents originating from agencies including the USAF, Army, CIA, DIA, DOD, and NSA.
accountAstronomer and USAF consultant J. Allen Hynek and Captain Edward J. Ruppelt, the first head of Project Blue Book, revealed the existence of a suppressed top-secret intelligence estimate from Project Sign that had been ordered destroyed by Hoyt Vandenberg.
measurementThe USAF's Project Blue Book concluded that less than 2% of reported UFOs were 'psychological' or hoaxes, while a study conducted by Allan Hendry for the Center for UFO Studies (CUFOS) found that less than 1% were hoaxes or psychological in nature.
claimIn 2019, U.S. Navy spokesperson Joseph Gradisher stated that the Navy and the U.S. Air Force take reports of unidentified aircraft very seriously for safety and security reasons and investigate each report.
claimThe Condon Committee was a University of Colorado UFO project headed by Edward U. Condon for the U.S. Air Force, which operated from 1966 to 1968.
measurementThe U.S. Air Force investigated more than 250 UFO cases between 1947 and 1949 under Project Sign.
claimIn late September 1947, the Air Materiel Command recommended that an official Air Force investigation be established and that other government agencies assist in the investigation.
claimProject Grudge was a U.S. Air Force investigation that succeeded Project Sign in February 1949 and was subsequently succeeded by Project Blue Book in March 1952.
measurementThe U.S. Air Force cataloged 12,618 UFO sightings between March 1952 and December 1969 as part of Project Blue Book.
claimMultiple U.S. intelligence and military agencies have collected information on UFOs, including the Defense Intelligence Agency (DIA), the FBI, the CIA, the National Security Agency (NSA), the U.S. Army, the U.S. Navy, and the U.S. Air Force.
accountA congressional hearing held on July 26, 2023, featured whistleblower testimony from former U.S. Air Force officer and intelligence official David Grusch regarding UFOs.
referenceGeneral Nathan Twining, a future USAF Chief of Staff, authored a memo on September 23, 1947, that recommended intelligence cooperation regarding UFOs between the Army, Navy, Atomic Energy Commission, the Defense Department's Joint Research and Development Board, Air Force Scientific Advisory Board, National Advisory Committee for Aeronautics (NACA), Project RAND, and the Nuclear Energy for the Propulsion of Aircraft (NEPA) project.
claimEdward Ruppelt, a retired U.S. Air Force Captain and former director of Project Blue Book, published 'The Report on Unidentified Flying Objects' in 1956.
quoteThe Bolender memo stated that reports of UFOs which could affect national security would continue to be handled through standard Air Force procedures designed for that purpose.
claimAllen Hynek, an astronomer who served as a USAF consultant starting in 1948, criticized the Condon Committee Report and authored two nontechnical books advocating for the continued investigation of UFO reports.
How the Pentagon Started Taking U.F.O.s Seriously | The New Yorker newyorker.com Apr 30, 2021 18 facts
accountIn a 1956 incident near a U.S. Air Force base in England, a preternaturally fast object was recorded on multiple radars.
quoteJohn Ratcliffe, the former director of National Intelligence, stated in a Fox News interview that UAP/UFO sightings involve objects seen by Navy or Air Force pilots or captured by satellite imagery that exhibit movements difficult to explain, are hard to replicate, exceed the sound barrier without a sonic boom, and utilize technology currently unavailable to the United States.
measurementThe UAP encountered by the unnamed Air Force lieutenant colonel was approximately forty feet long and resembled a giant Tic Tac.
accountThe U.F.O. encountered by the anonymous Air Force lieutenant colonel was approximately forty feet long, resembled a giant Tic Tac, and appeared to disobey known principles of aerodynamics.
accountIn 1980, several U.S. Air Force officers reported observing a U.F.O. at close range near R.A.F. Bentwaters in Rendlesham Forest, England, an incident often referred to as 'Britain’s Roswell.'
accountAn unnamed Air Force lieutenant colonel reported an extended encounter with a UAP during combat approximately a decade prior to March 2021, noting that the object registered on two of his plane's sensors.
claimThe U.S. Air Force shut down Project Blue Book in January 1970.
referenceThe U.S. Air Force initiated a classified study called Project Sign to investigate unidentified flying objects following concerns that a foreign rival, such as the Soviet Union, had achieved a significant technological breakthrough.
quoteJohn Ratcliffe, the former director of National Intelligence, stated in a Fox News interview that U.F.O. sightings involve objects observed by Navy or Air Force pilots or satellite imagery that engage in actions difficult to explain, exhibit movements hard to replicate, utilize technology the United States does not possess, and travel at speeds exceeding the sound barrier without producing a sonic boom.
accountIn 1980, several U.S. Air Force officers claimed to have observed a UFO at close range outside R.A.F. Bentwaters in Rendlesham Forest, England, an incident known as 'Britain's Roswell'.
claimGerald Ford, then House Minority Leader, called for congressional hearings regarding the Air Force's explanation of the Dexter, Michigan U.F.O. sightings, stating the public deserved a better explanation.
quoteVice Admiral Roscoe Hillenkoetter, the first director of the C.I.A., stated: 'Behind the scenes, high-ranking Air Force officers are soberly concerned about the UFOs. But through official secrecy and ridicule, many citizens are led to believe the unknown flying objects are nonsense.'
quoteMajor General John Samford, the Air Force’s director of intelligence, held a major press conference regarding U.F.O. reports, describing them as 'a certain percentage of this volume of reports that have been made by credible observers of relatively incredible things.'
claimVice Admiral Roscoe Hillenkoetter, the first director of the C.I.A., stated that high-ranking Air Force officers were soberly concerned about U.F.O.s, but that official secrecy and ridicule led citizens to believe they were nonsense.
accountAn anonymous Air Force lieutenant colonel reported an extended encounter with a U.F.O. during combat approximately a decade prior to March 2021, which registered on two of his plane's sensors.
claimGerald Ford, then House Minority Leader, called for congressional hearings regarding the Air Force's explanation of the Michigan U.F.O. sightings, stating the American public deserved a better explanation.
claimProject Blue Book was a U.S. Air Force program that operated out of Wright-Patterson Air Force Base near Dayton, Ohio, as a continuation of Project Sign.
quoteMajor General John Samford, the Air Force’s director of intelligence, held a press conference regarding U.F.O. reports, describing them as 'a certain percentage of this volume of reports that have been made by credible observers of relatively incredible things.'
The Evolution of the U.S. Intelligence Community-An Historical ... govinfo.gov 5 facts
claimThe CIA and the Air Force began planning for the first photo reconnaissance satellite in 1957, following the Soviet launch of Sputnik.
claimThe National Security Act of 1947 created the position of Secretary of Defense and unified the Army, Navy, and the newly-created Air Force under this position.
referenceExecutive orders issued by President Jimmy Carter (E.O. 12036, 1978) and President Ronald Reagan (E.O. 12333, 1981) defined the members of the Intelligence Community as the CIA, NSA, DIA, DOD reconnaissance offices, INR/State, intelligence elements of the Army, Navy, Air Force, Marines, FBI, Treasury, and DOE (then known as the Energy Research & Development Administration), with staff elements of the DCI added in these orders.
claimThe U-2 reconnaissance aircraft program was established as a joint CIA-Air Force effort, utilizing the CIA's special procurement authorities and secret operational capabilities.
claimThe National Reconnaissance Office (NRO) was formally established in 1961 pursuant to a national security directive to consolidate technical collection efforts previously conducted by the CIA and the Air Force.
Disclosure movement - Wikipedia en.wikipedia.org 4 facts
accountIn September 2025, Representative Anna Paulina Luna hosted a hearing that included testimony from former Air Force and Navy personnel Jeffrey Nuccetelli, Dyland Borland, and Alexandro Wiggins, as well as disclosure advocate George Knapp.
accountIn September 2025, Representative Anna Paulina Luna hosted a hearing that included testimony from former Air Force and Navy personnel Jeffrey Nuccetelli, Dyland Borland, and Alexandro Wiggins, as well as UFO disclosure advocate George Knapp.
accountIn 2023, retired Air Force intelligence officer David Grusch testified before the U.S. Congress, claiming the existence of a secret crash-retrieval and reverse-engineering program involving extraterrestrials, though he provided no evidence beyond what he had read or been told by others.
accountIn 2025, the Wall Street Journal revealed that hundreds of Air Force personnel had been falsely told there was a secret program to harvest alien technology, a practice described as a fraternity hazing ritual that spun out of control.
UFOs and the U.S. government: The push towards greater ... - WBUR wbur.org Nov 14, 2023 3 facts
claimDuring the summer of 1947, the U.S. Air Force investigated UFO sightings out of concern that the objects were secret Soviet craft developed by kidnapped Nazi rocket scientists.
accountIn 1947, the United States government underwent significant structural changes, including the creation of the Air Force as a standalone military service, the establishment of the Joint Chiefs of Staff, the creation of the National Security Council, and the formation of the CIA as the first peacetime intelligence agency.
accountThe U.S. government established several key national security institutions in 1947, including the Air Force as a standalone military service, the Joint Chiefs of Staff, the National Security Council, and the CIA as the first peacetime intelligence agency.
Review: Close Encounters of the Fifth Kind - Washington Examiner washingtonexaminer.com Apr 24, 2020 2 facts
claimThe documentary 'Close Encounters of the Fifth Kind' claims that the U.S. Air Force operates a program to abduct members of the public to trick them into believing they have been abducted by aliens.
claimDaniel Sheehan expresses criticism regarding the U.S. Air Force's protection of U.S. airspace against potentially hostile intruders.
U.S.-China Relations cfr.org 2 facts
accountPresident Joe Biden ordered the U.S. Air Force to shoot down a Chinese-operated balloon off the southeastern U.S. coast after security officials identified it as a surveillance craft spying on sensitive military sites.
perspectiveThe Chinese government characterized the balloon shot down by the U.S. Air Force as a civilian weather-monitoring craft that accidentally veered into U.S. airspace and condemned the action as a serious violation of international practice.
Consequences of the Russia-Ukraine War and the Changing Face ... rand.org May 22, 2025 1 fact
perspectiveThe U.S. Air Forces in Europe, the U.S. Air Force, and the U.S. Space Force should examine opportunities to leverage European Defense Industrial Base (DIB) and infrastructure improvements to support U.S. distributed air operations.
Iran's Islamist Proxies in the Middle East - Wilson Center wilsoncenter.org Sep 12, 2023 1 fact
measurementIn 2001, the United States sanctioned four leaders of Hezbollah al Hejaz linked to the 1996 Khobar Towers bombing that killed 19 U.S. Air Force personnel and wounded 372.
Ufology: From Fringe to Mainstream to Fringe? - Skeptic Magazine skeptic.com Feb 20, 2026 1 fact
accountThe U.S. Air Force terminated Project Blue Book, a program to study Unidentified Anomalous Phenomena, at the end of the 1960s.
History of the Central Intelligence Agency - Wikipedia en.wikipedia.org 1 fact
claimHoyt Vandenberg left the CIA on April 30, 1948, to become the commander of the newly established Air Force and was succeeded by Roscoe Hillenkoetter.
Steven M. Greer - Wikipedia en.wikipedia.org 1 fact
accountIn May 2001, Steven M. Greer held a press conference at the National Press Club in Washington, D.C., featuring 20 retired Air Force, Federal Aviation Administration, and intelligence officers.