Project Blue Book (1952–1969): A Systematic U.S. Air Force Investigation of Unidentified Flying Objects and Its Aftermath

To the point

From 1952 to 1969 the U.S. Air Force ran Project Blue Book to study unidentified flying objects, classify most sightings as natural phenomena, man-made objects, or meteorological events, assess any national security implications, and document that about 5.55% remained unidentified, with Captain Edward J. Ruppelt guiding a scientific approach that used standardized questionnaires, field investigations, radar data, and input from the University of Colorado and the National Academy of Sciences, while cases such as the Lubbock Lights showed how civilian reports could diverge from official explanations, and later investigations involving interviews, fighter jet intercepts, and improving radar technology, culminating in the 1969 Condon Committee report led by Edward Condon that concluded UFOs did not represent advanced technology or a security threat, leaving a lasting cultural impact and ongoing debates about declassification and unexplained sightings.