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.
3 We've decided, about last October, we decided there possibly was enough material now to reopen this case. So we, the center, appointed a permanent project engineer, which I'm the project engineer, and we reviewed all this stuff. We took all the cases that we had, reworked them, filed them all in a neat file so we could tell what we had. We went through and cross-indexed all the material so that we could get an idea of the different factors that were involved in these reports. We came up with some results. I won't say they're outstanding results, I don't... we don't know what the results mean. But, uh, unfortunately, I didn't realize we were going to have such a large audience here, so we did bring these slides along. I don't know whether you can... any of you in the back room see this print? I'll pass it around and you can get an idea. This is a plot of the sightings in the United States. Now, this does not include the... we have sightings outside of the United States, but we're not too worried about those at the present time. We're more interested in the United States. I'll explain this a little bit to you since you can't see it. We have certain areas in the United States where there are concentrations. In Dayton and Columbus, Ohio, there are concentrations. Now, this is possibly due to two things. One of them is the fact that the people in that area knew that all the activity in this project was taking place in that area, and consequently, they were doing a little bit more reporting. Another thing is that all the experimental flying was being done around Wright Field, and we still have a lot of trouble with that. People call in and say, "I just saw a great big light go over at 5,000 miles an hour," it turns over... it turns out it's an airplane carrying a flare or something like that. So we've disregarded that concentration. However, around all the ports in the United States—San Francisco, Los Angeles, the coastal area around New York City, and New Orleans—there's concentrations. Around Los Alamos and the Albuquerque area, there's concentrations. Around White Sands, there's concentrations, and down here at Camp Hood, Texas. Now, this Camp Hood, Texas concentration was due to an outbreak of odd lights about two years ago. They never did determine exactly what the lights were. They were a special, we might say, a special type of report that haven't occurred again, and we haven't paid too much attention to that. But the ones around Oak Ridge and the ones around Albuquerque may possibly mean something, we don't know. The rest of the reports are pretty well scattered out around the United States. If you plot these reports up by years, they started in the West Coast, up around in the Northwest, around Washington, Oregon, and Idaho in 1947. The next year, they were... they tended to be on the East Coast to a certain extent, and from then on, they were just spread out all over the United States. There was no, no pattern. We've plotted the frequency of these reports again. You'll see that it doesn't vary too much year from, uh, from year to year. This large peak down here occurred right after the first sighting by this Arnold out in Idaho, and it was undoubtedly, a lot of it was due to mass hysteria or people wanting to get their names in the paper. However, you can see it tapered off, and it reaches a peak right in, let's see, this is June and July, and every year, almost, it reaches a peak in there. It's also peaked to a certain extent here in January and then again, there's a peak here in December.
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.