Documents / FOIA release
This is a CIA History Staff monograph by Gregory W. Pedlow and Donald E. Welzenbach, published in Washington in 1992 and approved for release in 2011. It covers the CIA's manned overhead reconnaissance program from 1954 to 1974, which developed and flew the U-2 and the A-12 OXCART. It traces the U-2's development, the overflights of the Soviet Union, the downing of Francis Gary Powers on 1 May 1960, and later operations. One section is titled U-2s, UFOs, and Operation BLUE BOOK.
“RAF”5 pages
U-2 Operations in the Soviet Bloc and Middle East, 1956-1968 "-S7c71-7.e ifeRegal Chapter 3 93 EO 129581.6(dli1l>1010<25Yrs IS) -005653421 UNCLASSIFIED By January 1956, everyone working on Project AQUATONE could see that the U-2 was nearing the time for operational deployment. During tests the aircraft had met all the criteria established in late 1954. Its range of 2,950 miles was sufficient to overfly continents, its altitude of 72,000 feet was beyond the reach of all known antiaircraft weapons and interceptor aircraft, and its camera lenses were the finest available. OSA History, chap. II, pp. 10-15 (TS Codeword). 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.