The Pentagon’s latest UFO file drop includes an audio recording and transcript of a Project Blue Book presentation given in March 1952 by Capt. Edward J. Ruppelt. The recording includes confirmation the Air Force worked with the Battelle Memorial Institute as a contractor on UFO investigations. Burlison noted the audio was from an Air Force official seeking guidance from MIT scientists about some phenomenon, which he speculated was related to the 1952 sightings in Washington, D.C. While many sightings were believed to be misinterpretations of normal objects, [Ruppelt] noted 20% of the sightings were from reliable people and there were no conclusions to be drawn. He also noted certain concentrations of sightings, some around U.S. ports as well as around White Sands, a hub for missile testing, like Los Alamos and Camp Hood in Texas. Ruppelt said that while civilian reports tended to spike after publicity about major sightings, military reports continued in times when UFOs were not a topic of larger public attention. The audio also discussed a 1952 LIFE article that showcased UFO sightings it said were unexplained and quoted an Air Force officer saying the sightings were being taken seriously. The article sparked an increase in UFO sightings, including the 1952 Washington UFO incident, where hundreds of sightings were reported around the nation’s capital over the course of two weeks. The audio, captured prior to the article’s publication, confirms the Air Force did work with LIFE on the article.