The Pentagon on Friday, September 18, 2026, released a sixth installment of declassified files regarding unidentified anomalous phenomena (UAPs), commonly known as UFOs. The release features a 1952 audio recording and transcript of a Project Blue Book presentation led by U.S. Air Force Capt. Edward J. Ruppelt. Rep. Eric Burlison (R-MO) had previously advocated for the digitization and declassification of the recording.
Project Blue Book was a U.S. Air Force investigation into unidentified flying objects. The newly released recording, dated March 1952, captures Capt. Ruppelt discussing early reports from the late 1940s, including a 1947 sighting in Idaho. Ruppelt noted that while a 1949 review suggested some sightings were caused by hoaxes or mass hysteria, a subsequent review found hoaxes to be rare. The captain stated that 20 percent of sightings came from reliable sources and remained unexplained.
The recording confirmed that the Air Force employed the Battelle Memorial Institute as a contractor to provide experts, such as astronomers, for UFO investigations. Ruppelt also disclosed that the Air Force collaborated with LIFE magazine for a 1952 article. Although the Air Force provided material to encourage public information sharing, Ruppelt noted the military expected the article to be less sensational, including details about a pilot's death that they had anticipated would be excluded.
The declassification affects government transparency advocates, academic researchers, and citizens interested in the history of aerial phenomena. By releasing these records, the Pentagon provides historical data on how military officials and private contractors collaborated during the early Cold War to analyze unexplained sightings near locations like White Sands and Los Alamos.
Ruppelt noted that roughly one in five sightings reported by reliable observers at the time lacked a conventional explanation. For the general public, the primary change is the conversion of previously classified government audio into accessible public records. This allows individuals to hear firsthand the internal reasoning of 1950s-era officials who described silent, highly maneuverable "disc-shaped" objects for which the military then had no known silent power plant technology.
The release follows the disclosure of historical UAP records requested by members of Congress like Rep. Burlison. It also clarifies the historical role of private research institutions in government investigations. While the current release focuses on 1952, it coincides with modern reports of unexplained objects near military bases. The Pentagon's sixth drop continues a series of disclosures regarding the U.S. government’s history with unidentified phenomena.