Oak Ridge Flying Saucers, Gasser Atomic-Propulsion Interview, AEC Photograph-Suppression Operation, and the Bureau Policy Reversal of March 1949

Summary

Between July 1947 and March 1949, the Atomic Energy Commission, the U.S. Air Force Air Materiel Command, and the FBI executed an investigation of two photographs purportedly showing a “flying saucer” over Oak Ridge, Tennessee — taken by W. R. Presley, an Oak Ridge resident, in late afternoon July 1947 with a household camera while photographing his family at 218 Illinois Avenue. The investigation concluded eighteen months later that the photographs were not authentic — that the “ball of fire” was a drop of warm water or developer rolling across the negative emulsion. The deflationary determination came from the Air Materiel Command’s Technical Intelligence Division at Wright-Patterson AFB.

But the case file in 62-HQ-83894 documents three things that vastly outweigh the photographs themselves:

An AEC photograph-suppression operation. Once the photos began circulating, Colonel C. D. Gasser (USAF, AMC Engineering Field Officer at the Nuclear Energy for the Propulsion of Aircraft Research Center — the NEPA Project) instructed AEC Chief Investigator G. J. Rathman to recover all distributed copies. Rathman recovered twenty-four copies and instructed every recipient to “say nothing to anyone concerning them.” This was done in 1947–1948, before the photographs had been formally evaluated as authentic or fraudulent.
A confidential off-the-record briefing by Colonel Gasser to FBI Special Agent C. C. McSwain (Knoxville Office) in late 1948 that produced an Air Force atomic-energy / Soviet-attribution theory for the entire flying-saucer phenomenon, in primary form. Gasser stated explicitly that he was “not speaking officially” but offered his analysis “as a personal matter of cooperation,” reading from his “conversation with representatives at Wright Field and in reading reports returned to this country by foreign agents.”
A Bureau-level policy reversal. Hoover’s October 1, 1947 Bureau Bulletin #57 (Section 4 page 118) had instructed FBI field offices to stop investigating flying-disc reports and refer them to the Air Force. By March 14, 1949, on the strength of Gasser’s analysis, the Bureau re-engaged the field with an SAC letter and the Air Force’s February 15, 1949 “Unconventional Aircraft” memorandum, directing field offices to collect as much information as possible from complainants in order to assist the Air Force. The trigger for this reversal, named in writing in the Fletcher→Ladd memo, is Gasser’s confidential briefing.

This is the most operationally consequential single document in the 62-HQ-83894 paper trail mined so far. A single off-the-record conversation between an AMC nuclear-propulsion engineer and an FBI special agent in Tennessee, in 1948–1949, ended the FBI’s eighteen-month withdrawal from flying-disc investigation.

What the Oak Ridge Documents Document

The Presley photographs (Section 4 page 84, paragraph 2)

Mr. W. R. Presley of 218 Illinois Avenue, Oak Ridge TN, took the photographs in late afternoon July 1947 while photographing his family in front of his residence. The first frame captured what appeared to be a vapor trail. While winding the film to the next number he observed “the ball of fire” and exposed his last frame on it. He gave both photographs to the Knoxville News-Sentinel — which ran a story but published a print so indistinct that “the news story did not contain any factual information; and it was regarded generally by the public at the time as a possible trick” (Section 4 page 84).

The AEC photograph-recovery operation (Section 4 page 84, paragraph 3)

“Later, it was learned by Mr. RATHMAN and Colonel GASSER that PRESLEY had made several copies of this photograph and had distributed them among his acquaintances at Oak Ridge, Tennessee. Upon Colonel GASSER’s finding that the photographs had received some distribution, he requested Mr. RATHMAN as Head of the Compliance and Investigations Division, to recover as many as possible of the photographs, advise the persons in whose possession they were found to say nothing to anyone concerning them, and to return the said photographs to him for transmission to the United States Air Force Intelligence Service. Mr. RATHMAN advises that he succeeded in rounding up twenty-four copies of these photographs, and that, according to the statements of PRESLEY, no more copies were made or distributed.” — SAC Knoxville to Director, January 10, 1949 (Section 4 page 84, FBI serial 62-83894-153)

The sequence matters: photograph-recovery and witness-silencing came before the negative analysis. Gasser already wanted the images suppressed regardless of authenticity.

Rathman’s negative authenticity finding (Section 4 page 86, paragraph 1)

Rathman’s contemporaneous opinion of the negatives, before Wright Field analyzed them:

“Mr. RATHMAN that had the negative been ‘doped’ with some sort of chemical, it would have removed the emulsion from the face of the film in such a way that the negative would have been thin at the point which is supposedly a ball of fire, whereas, in fact, both the vapor trail and the corona of fire are dark on the negative, indicating that it was an actual exposure. It was the opinion of Mr. RATHMAN that the photographs were, without doubt, authentic.”

This is recorded in the file even though Wright Field would later reverse it. The progression is documented: AEC investigator’s contemporaneous reading “without doubt authentic” → Wright-Patterson AFB Technical Intelligence Division’s later water/developer-drop reading.

Gasser’s confidential interview (Section 4 pages 86–88, 103, 105)

The most substantive single off-the-record briefing in 62-HQ-83894 read so far. Gasser told FBI Special Agent C. C. McSwain that he was not speaking officially — “in that he was not speaking officially, but as a personal matter of cooperation. He stated that the matter was being given absolutely no dissemination by the air force or other military personnel, and that they had not deemed it advisable to advise him of all information pertaining to the missile” (Section 4 page 87).

Gasser’s analysis, structured:

On the photographs themselves and the evidence pattern:

The vapor trail “appears to be one single line of uniform intensity which is extremely slow in dissipating” — inconsistent with combustion-engine wing-tip or exhaust trails, which “even though only one line were visible, it would be rather quick to dissipate.”
The corona of “ball of fire” had “what appears to be layers of intensity which are circular rather than elongated and have no tendency to trail at the extremities, as would be the case if a normal type of exhaust from a combustion engine was being utilized.”
Both characteristics suggested to Gasser that “the vapor trail represents some atmospheric change along the path of the missile” — possibly indicating “a radio-active field is present.”
Reported approach pattern: missiles “usually approach the United States from a northerly direction and have been reported as returning in a northerly direction. None have ever been known to crash, collide or disintegrate over American soil, but it would appear that they come to the United States, cruise around, and go back over the North Pole.”
Reported speed-and-altitude control: “normally reported as being seen at tremendously high altitudes and always traveling in a straight line” but “when close to the ground, the missile travels at speeds which make possible visual observation of its actions.”

On propulsion:

“There is no known chemical fuel which would make possible tremendous range of flight such as is ascribed to the reported ‘flying saucers.’ There is only one possible fuel which could be utilized which is in accord with present theory, and that is the utilization of atomic energy” (Section 4 page 86).
“It has given impetus to the research being done by the air force in their own program of nuclear energy for the propulsion of aircraft to develop guided missiles” — i.e., the Oak Ridge NEPA Project (Nuclear Energy for the Propulsion of Aircraft) where Gasser was the resident AMC engineer (Section 4 page 88).

On Soviet origin:

“Knowledge of such a possible aircraft is not by any means new, it having been known as early as four years ago that some type of flying disc was being experimented with by the Russians” (Section 4 page 87, paragraph 2). “Four years ago” places the original intelligence at approximately 1944–1945.
“More recent reports have been received from representatives of the Central Intelligence Agency in Southern Europe and Southern Asia to the effect that the Russians were experimenting with some type of radical aircraft or guided missile which could be dispatched for great distances out over the sea, made to turn in flight and return to the base from which it was launched” (Section 4 page 87).
“It is a known fact that the Russians are attempting to develop some type of nuclear energy, that they received a wealth of information concerning nuclear energy at the time of their occupation in Germany, and that they too have at their disposal the limited supply of the necessary fissionable materials. He stated that insofar as any opinion as to whether or not they have the ability and scientific knowledge to create such a [crossed out in green ink: nuclear-propelled missile] is strictly a matter of conjecture, and that he would hesitate to make any definite statement. He pointed out, however, that the Russians have some very capable scientists in the field of atomic energy and that, in addition thereto, they took into their custody some of the most advanced and capable scientists of the German Nation” (Section 4 page 87).

The crossed-out phrase “nuclear-propelled missile” in green ink is a Bureau-internal redaction marker — a Bureau editor decided not to include that specific phrasing in the Director’s transmittal copy. The crossing-out itself is preserved in the OCR’d page.

On evidence and the Czechoslovakian collision report:

“There has never been any piece of one recovered from any source whatever in order that analytical study of its nature could be made. Insofar as was known to him, the only actual material which would be of any value in determining its nature are telephoto photographs which are now in the possession of engineers at Wright Field, Dayton, Ohio. How detailed and how clear these photographs are, he was unable to state.”
“He stated that one report has been received concerning a collision of these missiles with another type of aircraft. This report, according to him, took place a short time prior to the report of numerous discs over the United States, and the report emanated from Czechoslovakia. This report was that a Czechoslovakian transport had collided with some unidentified missile while in mid-air over the ocean, and that said missile and said transport had been completely disintegrated without recovery of parts or survivors from either. It was the belief of Colonel GASSER that this undescribed missile was perhaps the same type of thing as the flying saucer.”
(Section 4 page 88, paragraphs 1–2)

The Czechoslovakian transport collision is one of only two physical-evidence claims in Gasser’s entire briefing. The other is the Wright Field telephoto archive.

Bureau-level circulation (Section 4 pages 103, 105)

D. M. Ladd’s January 24, 1949 memorandum to “The Director” (FBI serial 62-83894-156) reproduces Gasser’s analysis as a Bureau-internal briefing. The routing list reaches the entire senior Bureau leadership: Tolson, Clegg, Glavin, Ladd, Nichols, Rosen, Tracy, Egan, Gurnea, Harbo, Mohr, Pennington, Quinn Tamm, Tele. Room, Nease, Holmes, Gandy.

Tolson and Ladd are checkmarked as having read it. This is Hoover-level distribution of an Air Force atomic-propulsion / Soviet-attribution theory of flying saucers, transmitted on the strength of an off-the-record AMC engineer’s confidential briefing, in January 1949.

The Wright-Patterson deflationary determination (Section 4 pages 112–113)

Gasser’s own February 10, 1949 letter to Rathman, written from “NEPA Project, P. O. Box E, Oak Ridge, Tennessee,” forwarding the Wright-Patterson AFB Technical Intelligence Division’s analysis:

“When the negative, containing the sphere, is examined by strong incident light, it is noted that the emulsion is raised at that point above the normal level of the remaining emulsion. This indicates that either a drop of warm water or a drop of developer struck the film at this point and rolled down this negative and the succeeding negative.

“To further substantiate this, it will be noted that when the two (2) negatives are placed side by side with the edges of the film aligned, the so-called ‘trail’ is continuous, that is the two sections match, indicating the drop rolled on from one negative to the next.

“Still further proof is shown on the fogged edge of the negative containing only the trail. This is proven by the fact that the trail extends beyond the normal format of the negative. In other words, there is a trail of that section of the negative which was not exposed in the camera. This effect shows up in one negative and not in the other because the negative in question is fogged; therefore, this irregularity was developed.

“Still further proof of these defects lies in the number of unevenly developed sections of the negative.” — Wright-Patterson AFB Technical Intelligence Division finding, transmitted by Col. C. D. Gasser to G. J. Rathman, AEC Security Division, February 10, 1949 (Section 4 pages 112–113)

Gasser’s recommendation: “It is recommended that this entire matter be declassified and that Mr. Presley be advised of the nature of the images, if and when the negatives are returned to him by your office.”

The crucial follow-up (Section 4 page 109)

SAC Knoxville’s February 18, 1949 transmittal to Director (FBI serial 62-83894-158) forwards Gasser’s deflationary letter — but adds a critical preserving statement:

“Colonel GASSER personally advised that while the photographs are not real, his statements made concerning the existence of flying saucers and the opinions expressed by him nevertheless stand as previously stated.” — SAC Knoxville C. C. McSwain to Director, February 18, 1949 (Section 4 page 109)

This is what makes the case operationally important: the photographs were declared inauthentic, but Gasser explicitly preserved his theoretical analysis of flying saucers as Soviet atomic-propulsion missiles. The negative-defect determination did not retract his briefing; it only retracted the Presley photos themselves as evidence. The FBI’s working theory of the flying-saucer phenomenon — by way of Gasser — was Soviet origin, atomic propulsion, northern approach pattern, never recovered, only photographed by Wright Field telephoto.

The Bureau’s policy reversal (Section 4 page 118)

Mr. Fletcher’s March 14, 1949 memo to Mr. Ladd (FBI serial 62-83894-160) is the operational consequence. Reading in full:

PURPOSE: The approval of the Executives Conference is requested for the attached SAC letter furnishing to the field the type of information desired by the Intelligence Division of the Air Force in connection with the captioned matter.

BACKGROUND: You will recall that by Bureau Bulletin #57, Series 1947, dated October 1, 1947, the field was advised that effective as of that date the Bureau had discontinued its investigative activities in connection with flying discs. The field was advised that all future reports concerning this matter received in the field should be referred to the Air Forces.

Colonel C. D. Gasser, Resident Engineer, Air Materiel Command, Nuclear Energy for the Propulsion of Aircraft Research, Oak Ridge, Tennessee, has recently and confidentially advised the Bureau that flying discs are believed by the Air Force to be man-made missiles rather than some natural phenomenon and that as much as four years ago it was learned that some type of flying discs were being experimented upon by the Russians. It was further determined from Colonel Gasser that most all of the flying discs seen by persons in the United States approached this country from a northerly direction and returned in the same direction, indicating the strong possibility that they are coming from Russia.

The Department of the Air Force has furnished to the Bureau a sufficient number of copies of a memorandum dated February 15, 1949 captioned “Unconventional Aircraft” which can be furnished to our field offices.

RECOMMENDATION: It is recommended that the attached SAC letter and enclosure be forwarded to the field to advise them of the type of questions to be asked of persons who voluntarily submit information relative to “flying discs.” Although no active investigation will be conducted by the Bureau, it is believed that the captioned matter is of sufficient importance to the internal security of the country that our field offices should secure as much information as possible from complainants in order to assist the Department of the Air Force.

The “F I V E” stamp at the bottom (“Mossburg”) and the “APR 8 1949” approval stamp confirm the SAC letter was approved for distribution to field offices in early April 1949.

This is the document that closes the loop:

October 1947: Bureau Bulletin #57 stops FBI field-office flying-disc investigations.
Late 1948: Gasser briefs FBI SA McSwain off the record at Oak Ridge.
January 10, 1949: SAC Knoxville transmits Gasser’s analysis to Director.
January 24, 1949: Ladd memo circulates Gasser’s analysis to entire Bureau leadership.
February 15, 1949: USAF “Unconventional Aircraft” memorandum (referenced; original outside this archive).
February 18, 1949: SAC Knoxville confirms photo-deflation but preserves Gasser’s theoretical claims.
March 14, 1949: Fletcher to Ladd memo recommends SAC field-office letter directly citing Gasser.
April 8, 1949: Approval stamp. SAC letter and “Unconventional Aircraft” enclosure go to field. The October 1947 withdrawal is effectively reversed for collection purposes.

Why This Matters

A single off-the-record AMC engineer’s briefing produced FBI policy reversal at the Director level. Gasser is named explicitly in the Fletcher→Ladd memo as the trigger. This is documentary evidence of how confidential one-on-one military-engineer / FBI-agent conversations shaped intelligence-collection policy in the early UAP era.
The FBI’s primary-source position on flying saucers, in 1949, was Soviet atomic-propulsion guided missiles. Not weather phenomena, not delusions, not aliens. The Soviet-attribution thesis dominated the Bureau-internal record for at least the next eighteen months — and it is documentary evidence that the FBI took Soviet capabilities seriously enough to overturn its own October 1947 stand-down.
The AEC photograph-suppression operation predates the authentication finding by 18+ months. Gasser had Rathman recover 24 distributed copies and silence the recipients in 1947–1948, before Wright-Patterson AFB made any analytical determination. AEC-side reflexive suppression was the default. Authentication was a downstream concern.
The Czechoslovakian transport-collision report is a citable in-primary-FBI-source claim of an air-to-air mid-ocean disintegration prior to July 1947. The detail appears nowhere else in 62-HQ-83894 read so far. Outside this archive, this would be a Czech aviation-records / Project SIGN cross-reference candidate.
The “as early as four years ago” Russian-flying-disc dating places the Air Force’s earliest intelligence-of-Soviet-disc-experimentation at ~1944–1945. This is a falsifiable historical claim about WWII-era Soviet aerospace research — checkable against Soviet aviation-history archives now declassified.
The Wright-Patterson Technical Intelligence Division’s water-drop / developer-drop analysis is a model of mid-century photo-forensic deflation — multi-pronged (raised-emulsion examination under incident light; trail-continuity across two adjacent negatives; trail-extension beyond format edge proving non-camera origin). The methodology is the same one used today.
Gasser was the principal Army technician at the NEPA Project — Nuclear Energy for the Propulsion of Aircraft Research at Oak Ridge — i.e., the U.S. nuclear-propelled-aircraft program. His Soviet-attribution analysis was made by the man who knew most about the U.S. side of the same problem. His “no known chemical fuel” reasoning is from inside-the-NEPA-program expertise, not from popular speculation.
Bureau Bulletin #57 (October 1, 1947) is named in primary form as the moment the FBI formally exited flying-disc investigation. This is a citable date for a cleanly-documented bureaucratic withdrawal that historians have had to work from circumstantially before this release.

Connections

Open Questions

The February 15, 1949 Department of the Air Force “Unconventional Aircraft” memorandum referenced in Fletcher→Ladd. Not in this archive (or not yet located in the OCR’d Sections). If it surfaces in Project Grudge or BLUE BOOK records, it would be the bridging document between Gasser’s confidential briefing and the formal Bureau field-letter.
The Czechoslovakian transport collision report. Not located elsewhere in 62-HQ-83894 mining so far. Czech aviation accidents in 1946–1947 are now searchable in Eastern European archives — a cross-reference candidate for someone doing serious primary-source UAP history.
The Wright Field telephoto photograph archive that Gasser referenced as the only existing physical evidence. If those telephoto photographs survive, they would be at the National Archives under Air Materiel Command Technical Intelligence Division records, ~1947–1949. Not in this PURSUE release.
Bureau Bulletin #57 itself (October 1, 1947). Referenced in primary form; full text not in Section 4. May be in Section 2 around the August 30–September early dates.
The SAC letter approved April 8, 1949 for distribution to all field offices. Field-office reactions and the “type of questions” enumerated in the enclosure are not in Section 4 mining. Possibly in Section 5.
CIA Southern Europe / Southern Asia reports of Soviet returnable-missile experimentation. Gasser’s cited intelligence source, ~1948. CIA historical records released since.
Whether Presley was ever told the negative-defect finding. Gasser’s February 10, 1949 letter recommended Presley be informed “if and when the negatives are returned to him by your office.” Whether AEC followed through is not in this archive.

Quotes Worth Keeping

“Mr. RATHMAN as Head of the Compliance and Investigations Division [was instructed] to recover as many as possible of the photographs, advise the persons in whose possession they were found to say nothing to anyone concerning them, and to return the said photographs to him for transmission to the United States Air Force Intelligence Service. Mr. RATHMAN advises that he succeeded in rounding up twenty-four copies of these photographs.” — SAC Knoxville to Director, January 10, 1949 (Section 4 page 84). The AEC photograph-recovery and witness-silencing operation, in primary FBI source, conducted before the photographs had been formally authenticated or refuted.

“There is no known chemical fuel which would make possible tremendous range of flight such as is ascribed to the reported ‘flying saucers.’ There is only one possible fuel which could be utilized which is in accord with present theory, and that is the utilization of atomic energy.” — Col. C. D. Gasser, AMC Engineering Field Officer at the NEPA Project, off-the-record briefing to FBI SA C. C. McSwain (Section 4 page 86; reproduced Section 4 page 103, FBI serial 62-83894-156). The U.S. nuclear-propelled-aircraft program’s principal Army technician arguing — to the FBI — that flying saucers must be atomic-energy-propelled.

“It has been known as early as four years ago that some type of flying disc was being experimented with by the Russians. In addition thereto, more recent reports have been received from representatives of the Central Intelligence Agency in Southern Europe and Southern Asia to the effect that the Russians were experimenting with some type of radical aircraft or guided missile which could be dispatched for great distances out over the sea, made to turn in flight and return to the base from which it was launched.” — Gasser, in SAC Knoxville to Director, January 10, 1949 (Section 4 page 87). The Soviet-disc-experimentation claim, dated to ~1944–1945, transmitted to FBI senior leadership in primary form.

“A Czechoslovakian transport had reportedly collided with some unidentified missile while in mid-air over the ocean, and that the missile and transport were completely disintegrated without recovery of parts or survivors from either.” — Gasser, Section 4 page 105 (reproduced from page 88). The pre-July-1947 air-to-air mid-ocean disintegration claim.

“Colonel GASSER personally advised that while the photographs are not real, his statements made concerning the existence of flying saucers and the opinions expressed by him nevertheless stand as previously stated.” — SAC Knoxville to Director, February 18, 1949 (Section 4 page 109, FBI serial 62-83894-158). The deflationary determination of the photographs did not retract Gasser’s theoretical analysis. The FBI received both findings on the same record.

“It was further determined from Colonel Gasser that most all of the flying discs seen by persons in the United States approached this country from a northerly direction and returned in the same direction, indicating the strong possibility that they are coming from Russia.” — Mr. Fletcher to Mr. Ladd, March 14, 1949 (Section 4 page 118, FBI serial 62-83894-160). The Bureau’s working theory of the flying-disc phenomenon as of March 1949, named-source-attributed in primary FBI internal correspondence.

“Although no active investigation will be conducted by the Bureau, it is believed that the captioned matter is of sufficient importance to the internal security of the country that our field offices should secure as much information as possible from complainants in order to assist the Department of the Air Force.” — Fletcher to Ladd, March 14, 1949 (Section 4 page 118). The operational reversal of Bureau Bulletin #57’s October 1, 1947 stand-down — preserved in language that distinguishes “active investigation” (still off limits) from “as much information as possible from complainants” (now back on).