Documents / FOIA release
This is a CIA History Staff monograph by Gregory W. Pedlow and Donald E. Welzenbach, written in 1992 and approved for release in 2011. It covers the CIA's manned overhead reconnaissance program from 1954 to 1974 and its two aircraft, the U-2 and the A-12 OXCART. It follows their development, the overflights of the Soviet Union, the downing of Francis Gary Powers in 1960, and later operations. One section is titled "U-2s, UFOs, and Operation BLUE BOOK."
“United Press”14 pages
Seratov Engels Airfield, 6 December 1959 Licklider. "Missile Gap Controversy.- pp. 608-609. **13'ec.14.1. CO5653421 UNCLASSIFIED OFORN Chapter 4 165 Staff Nathan Twining each gave different figures for the number of deployed Soviet missiles. Although the CIA figures were based on evidence gained from overflights, Dulles could not reveal this fact to the Senate and, therefore, faced very sharp questioning:4 As a result of these Senate hearings, Dulles was determined to obtain permission for more overflights in order to settle the mis- sile-gap question once and for all and end the debate within the intelli- gence community. To accomplish this, Dulles proposed photographing the most likely areas for the deployment of Soviet missiles. At this time there was still no evidence of SS-6 ICBM deployment outside the Tyuratam missile test range. Because the SS-6 was extremely large and liquid fueled, analysts believed these missiles could only be de- ployed near railroads. Existing U-2 photography showed railroad tracks going right to the launching pad at the test site. Dulles, there- fore argued that SS-6 installations could easily be located by flying along railroad lines. Dulles was supported by members of the UNCLASSIFIED
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FOIA release, from the cia-readingroom collection. The PDF is mirrored here; the original link is under it. 406 pages are in the text index: search them above, or from the library's search.