DOW-UAP-D154 — Ruppelt’s 1952 briefing: unresolved reports and better measurements

The document identifies itself as a March 1952 presentation by Captain Edward J. Ruppelt about the Air Force investigation of unidentified flying objects.

Transcript of a Presentation by Captain Edward J. Ruppelt, 1952 This document is a transcript of a March 1952 presentation by Captain Edward J. Ruppelt

The presenter said the Air Force had about 800 cases on record and characterized roughly 20 percent as strong reports for which no conclusion could be drawn.

Going back, we have approximately 800 cases now on record. … about 20% are very good reports offered by very reliable people and are just absolutely no conclusions can be drawn.

The presentation reported concentrations around Los Alamos and Albuquerque, while saying that the Oak Ridge and Albuquerque concentrations might mean something but were not understood.

Around Los Alamos and the Albuquerque area, there's concentrations. … the ones around Oak Ridge and the ones around Albuquerque may possibly mean something, we don't know.

The presenter said reported disc and spherical categories were grouped because a report might not reliably distinguish a disc from a sphere.

we don't believe that people can tell if they're seeing a disc or a sphere unless they should happen to see it both on the bottom view and edgewise

The presenter attributed reports of silent and maneuverable disc- or spherical-shaped objects to the source records, while framing the object type as an assumption.

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.

The presentation described a method for testing balloon explanations using launch time, ascent rate, winds aloft, and sight lines rather than assuming a nearby launch explained a report.

We can get the time of launch of the balloon, the rate of ascent, the winds aloft, we can plot out the path of that balloon and plot out the pilot's path

The presenter described Lincoln LaPaz as studying green fireballs near Albuquerque and said the accounts had not yielded a conclusive explanation.

there's a Dr., uh, Lincoln LaPaz down in Albuquerque at the University of New Mexico who's been making a big deal out of these green fireballs.

The presentation described diffraction gratings on cameras as a planning-stage approach for gathering physical information about reported lights.

one of our approaches on this thing is going to be the use of diffraction gratings on cameras. … that's just strictly in the planning stage now

The presenter said Air Defense Command radar tracks were reported between 1,000 and about 3,500 miles per hour, while saying they could have been radar malfunctions or atmospheric phenomena.

the Air Defense Command radars tracked objects going anywhere from 1,000 up to about 3,500 miles an hour. We've never been able to determine, however, that these weren't malfunctions

The presentation said proposed radar-scope cameras were intended to obtain images alongside returns because prior accounts were based on the observer's interpretation of a scope.

Before, we just had the radar observer's interpretation of what he saw on the scope. We think that with pictures, probably we can do a little bit more with this.

The presenter said there was no proof of what the reported phenomena were and listed balloons, meteors, ducks, and odd angles or lighting as possible explanations.

We've got no real proof that anything even exists. … there's a possibility that everything that's being reported is some, is a balloon or is a meteor or ducks

The transcript says a T-33 and radar episode near Fort Monmouth ultimately broke down into a balloon explanation and problems with radar procedures.

it turned out that the pilots had seen a big balloon. It was larger than a normal weather balloon, had been launched at Fort Monmouth.

The presentation says the radar-sighting problem remained unresolved because some returns could be explained by atmospheric conditions or equipment effects.

there's so many of them that can be explained as there's a possibility that it is something either in the atmosphere or in the set.

The transcript describes a reporting directive from Headquarters USAF and says a replacement directive had been prepared because the existing procedure had weak points.

There is a directive from Headquarters, USAF, that establishes a reporting procedure. … We've also felt that it was not a very good one. It had a lot of weak points in it.

In discussing public reporting, the presentation says the project was carried as confidential and that some details of sightings were being considered for declassification to restricted.

we actually, we carry it as confidential, the overall project. We're trying to get it dropped down to restricted now