CIA-UAP-D021, Analysis of Unconventional Aircraft Sightings, 1955
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.
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Document Intel
Source status, provenance, and extraction context.
- Source
- War.gov PURSUE
- Type
- Report
- Classification
- Unclassified
- Agency
- CIA
- Reference #
- RELEASE-04-FILE-012-CIA-UAP-D021-ANALYSIS-OF-UNCONVENTIONAL-AIRCRAFT-SIGHTINGS-1955
- Published
- 2026-07-10
- Content Type
- application/pdf
- Pages
- 4
Structured Analysis
Claims and source material extracted from the document text. Timeline context is surfaced in document intel.
The analysis describes two lights that initially approached the train and then rose vertically and passed over the observers.
Two lights were reported rising vertically before passing over the observers.
It cautioned that the principal witness could not see an object body clearly and that his observation was conditioned by another observer’s remarks.
The principal witness did not clearly observe the body of an object.
The memorandum concluded that this testimony alone could not confirm an unconventional aircraft and called for more careful questioning of the other witnesses.
The testimony alone was judged insufficient to confirm an unconventional aircraft.
The document cited Howard Robertson’s panel as having explained almost all examined reports and finding no security threat in the residual sightings.
The panel was described as explaining almost all of the sightings it reviewed.
It separately noted Canadian Avro work on a proposed saucer-like aircraft, while emphasizing that the project remained at an early stage.
Canadian Avro work on a saucer-like aircraft remained at an early stage.
Chronology extracted from the document text.
Delegation sighting analyzed
The CIA assessed testimony about lights observed from a train in the Soviet Union.
Avro aircraft project noted
The memorandum described Canadian development work as early-stage.
Robertson Panel assessment referenced
The CIA analysis cited the panel’s review of UFO reports and its no-threat conclusion.
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UFO Files Release Tracker
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Release 04 Documents
Other War.gov PURSUE files in this release.
document · Department of War · 1948DOW-UAP-D097, Project Sign Progress Report, 1948
document · CIA · 1955CIA-UAP-D020, Memorandum on Unconventional Aircraft Sightings, 1955
document · Department of Energy · 3/22/49DOE-UAP-D004, Los Alamos Conference on Aerial Phenomena, 1949
document · Department of War · 4/28/49DOW-UAP-D094, Analysis of Flying Object Incidents in the United States, 1949
document · Department of Energy · 9/1/15DOE-UAP-D005, Pantex Unidentified Object Incident Report, 2015
document · Department of War · 2020DOW-UAP-D089, Range Fouler Debrief, Eastern United States, 2020
document · Department of War · 2019DOW-UAP-D090, Range Fouler Debrief, Eastern United States, 2019
document · Department of War · 2020DOW-UAP-D091, Range Fouler Debrief, Atlantic Ocean, 2020