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.
16 they're not 80% definitely proved, but say 60 definitely. I mean, there's no question in our mind it was a plane or something else. And then, these are rough figures, say 20% that maybe could have been a plane, a balloon, or a meteor. And then there's that 20% like the green fireballs and the lights that we just do not have an answer for. Now, one thing that people have suggested, 'Well, how about a feasibility study?' Well, you, a feasibility of what? The unknown. We're stuck there." (Question from audience) • "Have all the intelligence officers of the bases and units been alerted on this and they report everything, or is the military generally alerted to this?" • "Yes, we, we should have brought that out early. There is a directive from Headquarters, USAF, that establishes a reporting procedure. Now, we felt for a long time, like most directives, particularly if there's no activity on it, people forget about it. I mean, it gets stuck off in the file. We've also felt that it was not a very good one. It had a lot of weak points in it. So we prepared a new directive, and in the meantime suggested that they go ahead and remind all of these people that there is a reporting procedure set up so that it would bring reports in. And the new directive has just recently been coordinated, I believe, hasn't it? It's going back to DOI right now." • "And it should be out. Now, Lieutenant Ruppelt, in getting around on these cases, of course, does a lot of missionary work because when he hits a base, I mean, he briefs them pretty thoroughly on our problem. And the places he's hit, I'm sure, are well aware of how it's done. I'm equally sure there are a number of these places that just don't know. They probably have a directive somewhere." • "I was just thinking of my own case. I knew you folks were interested from this association or others, but no still any efficient channel that never heard that there's any interest from..." • "How about the ground observer corps? They have 100,000 people, don't they? And they're quite active now, but I haven't..." • "We, they are to a certain extent, sir. We've talked about that quite a bit, and we don't know whether it's worth alerting those people. Now, they're not now on a 24-hour basis. They will, they hope to get them on a 24-hour basis soon. But, we don't know exactly how far to go. I mean, we're afraid maybe if we alert that number of people, then everybody in the United States will get excited again. That's the thing we're trying to keep out of this thing is this excitement business. Now, in two weeks, a week from this coming Friday, Life is coming out with an article on these objects, and we've been working closely with Life, and they're supposedly are going to print what we told them to. I hope they do. They're going to put it on a factual basis. I mean, just about like this briefing. In other words, there may be something to it, but we don't know. And we feel that that report
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.