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CIA-UAP-015, Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

Central Intelligence Agency · 312 pages · text from the file's own layer

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.

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I (12) Case XII. The object had windows in its top and front
and its top midsection. It also had a set of propellers
around its waist.
I It is not possible, therefore, to derive a verified model of a "flying
I saucer" from the data that have been gathered to date. This point is im
portant enough to emphasize. Out of about 4,000 people who said they saw
a "flying saucer", sufficiently detailed descriptions were given in only 12
I cases. Having culled the cream of the crop, it is still impossible to develop
a picture of what a "flying saucer" is.
In addition to this study of the good UNKNOWNS, an attempt was made
I to find groups of UNKNOWNS for which the observed characteristics were
the same. No such groups were found.
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I On the basis of this evidence, therefore, there is a low probability
that any of the UNKNOWNS represent observations of a class of "flying
saucers". It may be that some reports represent observations of not one
but several classes of objects that might have been "flying saucers";
however, the lack of evidence to confirm even one class would seem to make
I this possibility remote. It is pointed out that some of the cases of KNOWNS,
before identification, appeared fully as bizarre as any of the 12 cases of
I good UNKNOWNS, and, in fact, would have been placed in the class of good
UNKNOWNS had it not been possible to establish their identity.
I This is, of course, contrary to the bulk of the publicity that has been
I given to this problem. The reason for the nature of this publicity was
clearly brought out during the re-evaluation study. It is a definite fact that
upon reading a few reports, the reader becomes convinced that "flying
I saucers" are real and are some form of sinister contrivance. This reaction
is independent of the training of the reader or of his attitude toward the
problem prior to the initial contact. It is unfortunate that practically all of
the articles, books, and news stories dealing with the phenomenon of the
I "flying saucer" were written by men who were in this category, that is,
I men who had read only a few selected reports. This is accentuated by the
fact that, as a rule, only the more lurid-sounding reports are cited in these
publications. Were it not for this common psychological tendency to be
captivated by the mysterious, it is possible that no problem of this nature
I would exist.
I The reaction, mentioned above, that after reading a few reports, the
reader is convinced that "flying saucers" are real and are some form of
I sinister contrivance, is very misleading. As more and more of the reports
are read, the feeling that "saucers" are real fades, and is replaced by a
feeling of skepticism regarding their existence .. The reader eventually
reaches a point of saturation, after which the reports contain no new infor
I mation at all and are no longer of any interest. This feeling of surfeit was
I universal among the personnel who worked on this project, and continually
necessitated a conscious effort on their part to remain objective.
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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.