THE DOCUMENTS
CIA-UAP-D020, “Memorandum on Unconventional Aircraft Sightings, 1955”, and CIA-UAP-D021, “Analysis of Unconventional Aircraft Sightings, 1955”, two Central Intelligence Agency records from the U.S. Department of War’s PURSUE Release 04, published at war.gov/ufo, cleared 10 July 2026. Both are memoranda for the Director of Central Intelligence signed by Herbert Scoville Jr., Assistant Director for Scientific Intelligence. The debriefing memorandum is dated 31 October 1955; both concern an observation made from a train travelling through the Soviet Union, in present-day Azerbaijan.
Why this one is worth your time
Release 04 publishes a paired set: the CIA’s debrief of a sighting, and the agency’s contemporary analysis of the same sighting. The witnesses were not anonymous airmen. Per the release’s description, the party of four included a United States senator, Richard Russell, then chairman of the Senate Armed Services Committee, along with a U.S. military service member and two U.S. government officials, travelling by rail between Baku and Tiflis (now Tbilisi) in 1955. This briefing sets out what each memorandum records, in its own terms, keeps the agency’s own conclusion as attributed record, and notes plainly where the released copies are too degraded to quote.
What the documents say
CIA-UAP-D020 summarises the debriefing of all four members of the party. CIA-UAP-D021 is the companion analysis, written over the same signature. Each travelled under a CIA Top Secret control cover sheet, and the classification markings on the released copies are struck through, with a declassification stamp added for the 2026 release.
The journey and the first sighting. The debriefing memorandum records that the party was travelling by train from Baku to Tiflis at Senator Russell’s specific request, the senator having tried to use rail transport whenever feasible. The sightings were noted about ten minutes beyond Alyaty at 1910 hours, when it was already dark. Russell, resting alone in his compartment with the lights out, noted a small greenish-yellow glowing ball rising quite rapidly. He informed the other members of the party, who were occupying the other compartment, and a few minutes later they too observed another object.
Four witnesses, four descriptions. The memorandum keeps the accounts separate. Russell never saw the form of the object, only the luminescent ball. Mr Efron saw only two lights resembling eyes. Colonel Hathaway saw a shadowy object with a single light in the middle at the top and a rotating light or lights similar to exhausts at the base. Mr Gros and Colonel Hathaway considered the object comparable in size to a U.S. jet fighter, while Russell had the impression it could have been as small as a rocket, the memo noting that nothing was available to give a satisfactory scale and that the rising ball left no trail. Hathaway is recorded as believing the object did not resemble any aircraft, rocket or missile he had ever seen. All observers agreed the object was rotating or whirling as it rose along its initial steep trajectory; Hathaway and Efron stated that it broke to horizontal flight quite sharply, while Russell and Gros noted no change. Only Gros reported anything on the ground besides a searchlight: a triangular object with three lights which appeared to be ejected from a launching site.
The debrief’s own assessment. The memorandum’s fourth paragraph states that, on the interviews so far, the only testimony which would support the existence of flying saucers or radically unconventional aircraft is Colonel Hathaway’s. The other observations, it concludes, can probably be explained as steep climbing aircraft or missiles; further discussions would probably be required before the matter could be completely resolved; and in the meantime the evidence did not appear sufficiently firm to warrant the conclusion that the Soviets had developed, and had in operation, a radically new type of aircraft.
The analysis, and the Prague dispatch. CIA-UAP-D021 opens on a dispatch from Prague, C-103, dated 13 October 1955, which had reported the sighting of two flying saucers or disc-like unconventional aircraft. An interview with Mr Efron, one of the four observers, failed to confirm the dispatch’s information in several respects. The analysis records Efron’s account: two lights which initially rose vertically, then approached the train and passed overhead at high altitude. He did not see the body of the object and had no feeling as to whether it was round, disc-like or even square; his only reason for calling it unconventional was that it rose vertically and appeared to glide in a manner unlike any aircraft he had seen. The author’s caveats are part of the record: it was dusk, Efron thought the object quite high, around 9,000 feet, and his observations, the memo states, were undoubtedly conditioned by Senator Russell’s remarks that he had seen a flying saucer, so that too much confidence could not be given to his observation; the absence of any noise may also have influenced his opinion. The memo records the author’s belief that Efron’s testimony alone could not confirm the existence of any unconventional aircraft, that he was not positioned to see as well as the others, and that a very careful interrogation of the other members was in order.
Two memoranda, one sequence. Read side by side, the documents record two stages of the same inquiry. The analysis was written when only Efron had been interviewed, and closes by calling for the careful interrogation of the rest of the party; the debriefing memorandum, dated 31 October, opens by recording that all four participants had by then been debriefed.
The Robertson citation, and Project Y. The analysis then reaches for context. Its third paragraph cites the panel Dr Robertson had headed two years earlier, recording that the group was able to explain almost all the U.S. sightings it examined and concluded that the phenomena represented no threat to the security of the United States; it adds that even if the present sightings inside Russia were confirmed, it should not be assumed that such aircraft had actually been flying over the United States. Its fourth paragraph surveys Project Y at Avro Aircraft Ltd in Canada, a USAF-supported development of unconventional saucer-like aircraft: still in early research, three or more years from a first prototype, with calculations indicating a possible ceiling up to 100,000 feet, speeds up to 1,800 miles per hour, a 700-mile range and a rate of climb of 120,000 feet a minute. The memo names John Frost as the project’s director, records that Frost was reported to have taken his original idea for the flying machine from a group of Germans just after the Second World War, and notes that the Soviets may have obtained information from the same German group. It closes by suggesting that General Samford report on the Air Force project’s progress at the Intelligence Advisory Committee meeting.
What the documents do not say
They do not say what the objects were. The debrief records four differing descriptions and an assessment framed in probabilities; neither memorandum identifies the objects, and the matter is left, in the debrief’s own words, not completely resolved.
The legible portions of the released pages give no date for the sighting itself, only the time of evening and the stretch of line where it happened. The debrief carries its own drafting date of 31 October 1955; the analysis carries no date line on its released pages, and is placed in time by the 13 October dispatch it opens with.
The released copies are smudged 1955 typescript carbons. They can be read by eye, but the machine-extracted text is corrupted through most of both documents, which is why this briefing summarises rather than quotes them (see the note under From the record). The release database flags CIA-UAP-D021 as carrying redactions.
They record one incident’s paperwork. There is no radar data, no photograph, and no record in these files of what the Intelligence Advisory Committee did with the suggestion that General Samford report on Project Y.
From the record
SIGNATURE RECORD AND COVER SHEET The heading of the CIA Top Secret control form attached to each memorandum
1 NOV 1955 The registry date stamp on the debriefing memorandum’s cover sheet
Approved for Release 2026 The declassification stamp on the released copies of both documents
Note on quotes: both memoranda are degraded 1955 typescripts, and the released text layer is corrupted through almost all of the body text. Only the byte-clean cover-sheet fragments above are quoted verbatim. The memoranda’s own wording, including the debrief’s fourth-paragraph assessment and the analysis’s caveats, is summarised in the body of this briefing rather than reproduced.
Where the case connects
The two memoranda sit inside a wider mid-fifties paper trail. Study No. 203, covered in Release 04 Briefing 1, records Air Force analysts in 1948 and 1949 reasoning that if the objects were foreign they should be presumed Soviet; here, six years later, a sighting inside the USSR is weighed in the same frame, against Soviet development on one side and U.S.-Canadian work on the other. The Project Y survey in the analysis runs directly into Release 04 Briefing 5, on DOW-UAP-D095, the Department of War file that carries the Scientific Advisory Board’s own assessment of the Avro work and a 1954 memorandum on circular aircraft being mistaken for flying saucers. The Robertson panel the analysis cites is covered in Release 03 Briefing 6.
The CIA’s other Soviet-side files connect too. Release 03 Briefing 9 covers the agency’s collected Soviet UFO reporting, and Release 03 Briefing 10 its foreign-sightings file, which includes CIA-UAP-006, an information report dated 4 October 1955 in which a U.S. tourist travelling the same line south of Baku toward Tiflis describes a triangular object with three lights rising from a launching site. The released documents do not state whether the two reports describe the same events. Release 02 Briefing 4 covers the 1973 CIA intelligence information report, another observation inside the USSR: there the agency filed a source’s account raw and unevaluated, while the two memoranda here show the other end of the paperwork, an analysis addressed to the Director.
The files leave their own loose ends. The Prague dispatch C-103 is cited but not included; the debrief summarises the four interviews without attaching them; and the analysis’s suggestion of a report to the Intelligence Advisory Committee has no recorded outcome in these pages. Any later tranche that releases the dispatch, the interview records, or IAC minutes touching Project Y lands in this series when it does.
Read it yourself
CIA-UAP-D020, “Memorandum on Unconventional Aircraft Sightings, 1955”, and CIA-UAP-D021, “Analysis of Unconventional Aircraft Sightings, 1955”, are hosted at war.gov in PURSUE Release 04.
Read the files. Decide for yourself.
Related wiki entries
The wiki entries below give background on the programme and publisher behind this briefing, and on the subjects it touches.
References and further reading
- CIA-UAP-D020, “Memorandum on Unconventional Aircraft Sightings, 1955”, PURSUE Release 04, U.S. Department of War, hosted at war.gov/ufo
- CIA-UAP-D021, “Analysis of Unconventional Aircraft Sightings, 1955”, PURSUE Release 04, U.S. Department of War, hosted at war.gov/ufo
- Presidential Unsealing and Reporting System for UAP Encounters (PURSUE), U.S. Department of War, war.gov/ufo
- AARO UAP Records, All-domain Anomaly Resolution Office, aaro.mil/UAP-Records
- Signals from the Periphery, Release 04 Briefing 1, on Study No. 203
- Signals from the Periphery, Release 04 Briefing 5, on the Avro file DOW-UAP-D095
- Signals from the Periphery, Release 03 Briefing 6, on the Robertson Panel
- Signals from the Periphery, Release 03 Briefing 9, on the CIA’s Soviet UFO files
- Signals from the Periphery, Release 03 Briefing 10, on the CIA foreign-sightings file
- Signals from the Periphery, Release 02 Briefing 4, on the 1973 CIA intelligence information report