Documents / Hearing transcript
This declassified transcript, released by the Office of the Under Secretary of War, records a March 1952 presentation by Captain Edward J. Ruppelt on the Air Force's reorganized UFO investigation. Ruppelt reports that about 20% of roughly 800 cases remain unexplained and notes clusters of reports near Los Alamos, Albuquerque and Oak Ridge. He discusses the Lubbock lights photographs, the Phoenix 1947 photograph and the Mantell case. He concludes that the Air Force has no firm evidence about what the objects are.
From the source: Release of 2026-09-18 Incident: 3/26/52, Boston, Massachusetts. This document is a transcript of a March 1952 presentation by Captain Edward J. Ruppelt outlining the U.S. Air Force’s reorganized investigation into unidentified flying objects (UFOs). The presentation previews prospective technical methodologies, such as diffraction-grating photography and radar-scope synchronization, that were subsequently incorporated into Project Blue Book, a U.S. Air Force program active from 1952 to 1969 that investigated the nature and origin of UFOs. Ruppelt explains that out of approximately 800 historical cases reviewed by the Air Force, approximately 20% remained unexplained after technical analysis. These unresolved reports were sourced from credible military personnel, commercial pilots, and other qualified technical observers. He highlights geographic report concentrations around sensitive national security and nuclear weapons installations (including Los Alamos, Albuquerque, and Oak Ridge National Laboratories) and notes recurring anomalous characteristics, including silent high-speed flight and radar detections indicating unconfirmed air speeds between 1,000 and 3,500 miles per hour. Emphasizing that the Air Force found no conclusive evidence regarding the nature or origin of the phenomena, Ruppelt underscores the national security need for a systematic physical data collection effort to better evaluate these sightings.
17 may tend to take the mysteriousness and hysteria out of the thing and just get people to give us a few reports, you know, people with good common sense instead of all these nut letters that we get occasionally. Another thing, Colonel Kirkland referred to this newspaper clipping service, we hope to get that started before this Life magazine article comes out and keep it going over say a period of a year and see how the peaks in the newspaper publicity correspond with the peaks in this, in the reports that we get. We feel that after Life comes out, why then several other magazines will undoubtedly pick this stuff up. A True magazine is supposed to be coming out with an article sometime within the next couple months. It will be slanted the other way. It's going to be written by one of these science fiction writers, and it should give us no end of trouble. We haven't been able to get True to cooperate with us at all. I mean, I shouldn't say that, they probably would, but their type of magazine, I mean, they sell a sensational item, and they don't, they want to play it up. And then, I believe Look is also thinking about coming out with an article. So, magazines are going to follow Life and we'll probably run into a little bit of flak again on this thing. (Question from audience) • "Is it unlikely, or rather, is it likely that any of these magazines have facts or data which they would withhold just for the sake of being sensational?" • "Life magazine has a lot of information that we do not have on different sightings. They have some very good sightings too. I mean, they've called in some pretty important people around the United States. They won't, they're very hesitant to tell you who works for them as their consultants. But they have got some pretty good sightings that we have never heard of, and they're going to use those in their article, although they have checked those with us. The two or three old standbys that everybody always plays up, such as this Mantell case down in Kentucky where this guy got killed chasing one of them, supposedly, the one up in Sioux Falls, South Dakota where the F-51 pilot fought with this thing for 15 minutes, and a few of those that are outstanding as far as the science fiction writers are concerned, Life is going to leave out. They're not going to dig those up again and rehash them again." (Question from audience) • "Was it ever established what caused Mantell's death and disintegration?" • "Well, they think, I mean, the official report is, and I tend to believe it, is that he didn't have any oxygen at all, and he just climbed up until he passed out and then the airplane went into a dive and just tore itself to pieces. I think that that probably, what he was chasing is still open to discussion. It was either, probably either Venus or one of these great big Skyhook balloons that General Mills puts up, because there was one lost in the area at the time, although they were never able to say where it was, except that it was
Hearing transcript, from the pursue collection. The PDF is mirrored here; the original link is above. 19 pages are in the text index: search them above, or from the library's search.