Documents / Case file
This CIA archives copy, released in 2026, holds Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects). The Air Technical Intelligence Center at Wright-Patterson Air Force Base issued it on 5 May 1955. The study reduced about 4,000 sighting reports from 1947 to 1952 to IBM punched cards, with 3,201 cases charted, and applied chi square tests to compare known and unknown sightings. It concludes that it is highly improbable the reports represent technological developments beyond present-day scientific knowledge.
From the source:Release of 2026-06-12 This is the USAF Project Blue Book with a CIA cover sheet stating the document is "Official Record Copy." With the exception of the handwritten note on the first page, the content of this document has been available on CIA's public website.
I I I A "Certain" identification indicated a minimum amount of doubt regarding the validity of the evaluation. By "rule-of-thumb" reasoning, the proba bility of the identification being correct was better than 95 per cent. A "Doubtful'' identification indicated that the choice was less positive, but I that there was a better than even chance of being correct. I It is emphasized again that, as was tr.ue for other phases of evalua tion, preliminary and final identification was entrusted only to scientists and engineers who, in addition to their broad scientific background, had I received instruction, where necessary, in specialized subjects. The panel of consultants provided background information for this instruction. Many of the cases representing unusual features or maneuvers were submitted to I and discussed with various members of the panel of consultants prior to the final identification. I Consistency in the application of the knowledge necessary for making identifications was maintained by frequent collaboration among the person I nel involved, and systematic spot checks of the work. In addition to the general fund of knowledge required to identify satisfactorily a reported unidentified aerial object, an attempt was made to correlate specific data I such as flight plans of aircraft, records of balloon releases, weather con ditions, and an astronomical almanac with the reported sighting. I The procedure followed in making final identifications deserves ex planation because of the importance assumed by the identification as a basis I for statistical treatment. As was mentioned, a conference of four qualified I persons, two from A TIC and two from the panel of consultants, decided upon the final identification for each sighting report. This work was done at A TIC, periodically, as reports became ready. I During an identification conference, each sighting report was first studied, from the original data, by one person. If that person arrived at a decision, it was checked against the preliminary identification; if the two I identifications were the same, the report was appropriately marked and I considered finished. If the two identifications did not agree, the report was considered later by everyone participating in the conference until a group decision could be made. I If an evaluator was unable to categorize the report as one of the common objects or as a natural phenomenon, and his opinion was that the sighting should be recorded as UNKNOWN, a group decision was also re I quired on that report before it was considered finished. A group decision I was necessary on all reports finally recorded as UNKNOWN, regardless of what the preliminary identification had been. In cases where a group I decision was not made within a reasonable time, the report was put aside and later submitted to certain members of the panel of consultants for their op1n1ons. If, after this, disagreement continued to exist, the report of the sighting was identified as UNKNOWN. I 13 I
Case file, from the pursue collection. The PDF is mirrored here; the original link is above. 312 pages are in the text index: search them above, or from the library's search.