1952: Project Blue Book was one of a series of systematic studies of unidentified flying objects (UFOs) conducted by the United States Air Force (USAF)
A termination order was given for the operation December 1969, and all activity under its auspices officially ceased on January 19th, 1970.
Project Blue Book Goals -
To determine if UFOs were a threat to national security, and
To scientifically analyze UFO-related data.
Thousands of UFO reports were collected, analyzed, and was concluded there was nothing anomalous about UFOs, and a review of the report by the National Academy of Sciences, Project Blue Book was terminated in December 1969.
No UFO reported, investigated, and evaluated by the Air Force was ever an indication of threat to our national security;
There was no evidence submitted to or discovered by the Air Force that sightings categorized as "unidentified" represented technological developments or principles beyond the range of modern scientific knowledge;
There was no evidence indicating that sightings categorized as "unidentified" were extraterrestrial vehicles.
By the time Project Blue Book ended, it had collected 12,618 UFO reports, and concluded that most of them were misidentifications of natural phenomena (clouds, stars, etc.) or conventional aircraft.
I hopes of better education the public, the USAF has supplied us with this handy identification chart for you to use with your fellow flight crews, friends and family.