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 Balloons I Aircraft I ..... Astronomical Other I Insufficient Info - 7% I ,, Unknown - 3% I All available data were included in this study which was prepared by a panel of scientists both in and out of the Air Force. On the basis of this study it is believed that all the unidentified aerial objects could have been explained if more complete observational data had been available. Insofarfi as the reported aerial objects which still remain unexplained are concerned, there exists little information other than the impressions and interpretationsI I of their observers. As these impressions and interpretations have been replaced by the use of improved methods of investigation and reporting, and ,by scientific analysis, the number of unexplained cases has decreased rapidly I towards the vanishing point. Therefore, on the b_asis of this evaluation of the information, it is r· I considered to be highly improbable that reports of unidentified aerial objects examined in this study represent observations of technological developments outside of the range of present-day scientific knowledge. It is emphasized that there has been a complete lack of any valid evidence of physical 'matter I in any case of a [1 I I ' I I ' f I I I I I - 26% - 21% - 23% 20% reported unidentified aerial object. ix
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.