The closing report of Project Blue Book summarized 17 years of U.S. Air Force UFO investigation and formally ended the program.
What did the Project Blue Book final report conclude?
Announced in December 1969, the conclusions held that no UFO reported, investigated, or evaluated by the Air Force had ever indicated a threat to national security; that there was no evidence of technology beyond present-day scientific knowledge; and no evidence that the sightings were extraterrestrial vehicles.
What about the unexplained cases?
Of the 12,618 cases Blue Book investigated, 701 remained "unidentified." The Air Force attributed these largely to insufficient data rather than evidence of the extraordinary.
Why did Blue Book end?
The termination followed the 1968 Condon Report's recommendation that continued study was not scientifically justified.
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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
The U.S. Air Force’s UAP investigation program (1952-1969) that examined 12,618 reports, leaving 701 unexplained.
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