Project Blue Book was the longest-running official U.S. government study of unidentified flying objects, conducted by the U.S. Air Force.
What was Project Blue Book?
Running from 1952 to 1969, Project Blue Book systematically collected and analyzed UFO reports. It investigated a total of 12,618 sightings, concluding that most were misidentifications of natural phenomena or conventional aircraft.
What were Project Blue Book's conclusions?
The program found that 701 cases remained officially "unidentified." Its overall conclusions were that no UFO had threatened national security, that there was no evidence of technology beyond present-day capabilities, and no evidence of extraterrestrial vehicles.
Why was Project Blue Book terminated?
Following the 1968 Condon Report, which recommended against further study, the Air Force closed Project Blue Book in 1969.
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Related Intelligence
Condon Report (Scientific Study of UFOs)
The controversial 1968 University of Colorado study, funded by the USAF, that recommended against further UFO investigation.
Open file →Project Blue Book Final Report
The 1969 conclusion of the U.S. Air Force’s UFO program, finding no national-security threat and recommending termination.
Open file →House Intelligence Committee UAP Hearing
The May 17, 2022 hearing, the first open congressional UAP hearing in 54 years, featuring Pentagon intelligence officials.
Open file →Project Sign
The first official USAF UFO investigation (1947-1949), predecessor to Project Grudge and Project Blue Book.
Open file →