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

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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TABLE VIII CHI SQUARE TEST OF REVISED KNOWNS VERSUS IUNKNOWNS ON THE BASIS OF COLOR
Adjusted x2
' INumber of Number of Number of (K-n} 2
Color KNOWNS KNOWNS {K} UNKNOWNS ( n) K I
• White 281 95 112 3.04
Metallic 298 101 76 6. 19 INot stated 189 64 62 0.06
Orange 117 39 49 2.56 IRed 92 31 33 0. 13
Yellow 90 30 31 0.03
Green 32 11 14 0.82 IBlue 29 10 26}
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0.57Other 158 53 31
Total 1286 434 434 13.40
IDegrees of freedom 7
I5% 14. 1
1% 18. 5
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I70
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