Project Blue Book was an official US Air Force program for investigating UFO reports, active from 1952 to 1969.
Project Blue Book was the US Air Force program for investigating UFOs, managed by the Air Force's Air Technical Intelligence Center at Wright-Patterson Air Force Base in Ohio. It followed two earlier programs, Sign and Grudge, which operated from 1948 to 1951.
During its operation, more than 12,000 reports from military personnel and civilians were collected and examined. According to Air Force summaries, most were attributed to conventional explanations, while a minority remained unidentified. Among the preserved project documents is a file of correspondence from 1955.
In 1969, the Air Force concluded that no evidence was found that UFOs posed a threat to national security, represented advanced technology beyond existing scientific knowledge, or were extraterrestrial craft. The project's documents were transferred to the U.S. National Archives and are now accessible as historical research material.
An official US Air Force program for collecting and examining UFO reports.
It operated from 1952 to 1969, following earlier programs named Sign and Grudge.
According to Air Force summaries, more than 12,000 cases were examined.
In 1969, the Air Force concluded that no evidence was found that UFOs were a security threat, advanced technology beyond scientific knowledge, or extraterrestrial craft.