UNCLASSIFIED // PUBLIC RELEASERELEASE 04 · JULY 10, 2026
PENTAGON UFO FILE · DOCUMENT · CIA-UAP-D021Analysis of Unconventional Aircraft Sightings, 1955
This Top Secret memorandum, from the CIA’s Office of Scientific Intelligence in late 1955, is the analytical follow-up to the debriefing in CIA-UAP-D020. A party of Americans, including Senator Richard Russell, had reported seeing something rise from the ground while traveling by train in Soviet Azerbaijan. Here the agency weighs how much that report actually proved.
How the CIA read the sighting
The memo boils the observations down to two lights that climbed almost straight up near the train and then passed overhead at high altitude. It notes that one of the witnesses did not see a body behind the lights at all, and that the main reason for calling the object unconventional was the way it rose vertically. Its wording is hedged: the author does not think the testimony, as given, shows that the Soviets had flown a new kind of aircraft, though other members of the party were to be questioned more carefully.
It then puts the event in context. It repeats the 1953 Robertson panel’s finding that nearly all sightings posed no threat to the United States, and it describes Project Y, the saucer-shaped aircraft being developed at Avro Aircraft Ltd. in Canada with U.S. involvement, as still at an early stage.
Why it matters
The memo shows the agency treating a senator’s dramatic account with caution and checking it against what was known about real disc-shaped aircraft research. The parallel accounts are in CIA-UAP-006 and in the Air Force attaché’s report in file 5-2500.
The official description
From war.gov/UFO, released July 10, 2026, quoted in full
Sections 1 and 2 of this memorandum document a 1955 analysis of reports of “flying saucers” or “unconventional aircraft,” referencing the incident described in observer debriefings contained within CIA-UAP-D020. The memo summarizes the incident as consisting of two lights rising vertically, then passing above the observers. The memo contains caveating language that suggests the author concluded that the reports, as described, did not indicate the presence of an “unconventional aircraft.” Section 3 cites a previous finding by Dr. [Howard] Robertson (of the 1953 Robertson Panel) that “almost all the sightings […] represented no threat to the U.S.” Section 4 discusses the state of then-current research into “saucer-like aircraft” under Project “Y,” a contemporary joint U.S.-Canadian aerospace development program.