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Transcript of a Presentation by Captain Edward J. Ruppelt, 1952

U.S. Department of War · 1952-03-26 · 19 pages · text from the file's own layer

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.

DOW-UAP-PR160 · recording · 1952-03-26 Presentation by Captain Edward J. Ruppelt, 1952 This audio file records 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. Download (765 MB)
5
So that's some of the shapes that we've had. Now, getting back to this disc or spherical shaped
objects, these things are always silent. I mean, if we want to assume that this object we're dealing
with is a disc-shaped thing, these are always silent, and they're usually highly maneuverable.
Although lately, the reports that have been coming in have neglected to put this 90-degree turn
business in; they just go over at a great rate of speed. But the fact that they're silent is quite
interesting because we, we have no knowledge of any type of power plant that would be
completely silent.
These are the types of people that send in our reports. This segment here are civilians, and most
of these reports came in when the project was first initiated back in 1947 and '48. This black
segment here are reports from military sources, and they are, we've put them in as just ground
officers, not usually not flying officers, or at least the reports are not made from the air. We have
a small segment here of radar returns that we've been unable to explain. This section right here
are reports from civilian pilots who were airborne at the time of the sighting. This segment in
here especially is the one that we're very interested in. They're reports from airline pilots, from
tower operators, and balloon observers. Now, these balloon observers are normally people like
the General Mills crews that launch these high-altitude balloons. And here we have technically
trained personnel such as scientists, engineers, and so forth.
This segment, as I said, are the ones that we're very much interested in. Now, airline pilots are,
we consider very reliable because they're very, well, they don't like to stick their neck out and
make one of these reports unless they're absolutely sure they saw something. They received some
very unfavorable publicity during this last rash of reports, or the first one, I should say in '47 and
'48, and they absolutely refuse to give us reports unless they're completely sold that they saw
something. I've talked to quite a few of the pilots, and one of them made the statement if he
looked out his window and saw a V-2 rocket or something like that flying wingtip to wingtip
with him over Spokane, he wouldn't tell anybody about it. I mean, he'd never report it to the Air
Force because or to anybody because they just say he was crazy and probably ground him. So
that's the big difficulty we have in getting reports from airline pilots. We do hear through the
grapevine that they see an awful lot of odd things that they don't report, especially over in the
Near East, Iran, and the Middle East, I should say, Iran, Palestine, Egypt, in those runs. Now, we
haven't been able to pin that down as fact. That's just a rumor that we've picked up in talking to
other airline pilots who've heard other airline pilots say that, but we've never been able to pin it
down. However, it would be very interesting to find out, and we're making attempts, although
we've run up against a lot of trouble because, as I said, the pilots just don't want publicity and
they won't make those reports. This segment in here have been reported by Air Force pilots, and
they're aerial sightings. A lot of these have been balloons. We've had a lot of trouble with the
balloons in that a pilot meeting a balloon in the air isn't familiar with what that balloon's going to
do. I mean, he's familiar with meeting another airplane, and he's already made up his mind as to
what the rate of closure should be and different things like that. He'll usually assume that the,
when he meets a balloon, that it's instead of a balloon, it's some object about 30 or 40 feet in

Cases discussed

About this file

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.