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."
“The Pentagon”9 pages
Nkrer‹. OSA History, chap. 16. p. 8 (TS Codeword); Geary interview (S). CO5653421 UNCLASSIFIED --;;;CMATNC1E,02.....31N1 Chapter 3 152 Force of 31—with the more powerful Pratt & Whitney J75-P13 jet engine. This new power plant generated 4,200 pounds more thrust while adding only 2,050 pounds more weight. With its greater power, the engine permitted the U-2 to reach operational altitude more quick- ly, thereby reducing the telltale contrails that the U-2 produced as it passed through the tropopause at 45,000 to 55,000 feet. With the new engine, U-2 passed through this portion of the atmosphere faster and did so before entering hostile airspace, thus reducing the chance of visual detection. The J75 power plant also made it possible for the U-2 to carry a larger payload and gain another 2,500 feet in altitude, permitting it to cruise at 74,600 feet. The new engines were in very short supply because of the needs of the Air Force's F- 105 construc- tion program, but Colonel Geary used his Air Force contacts to obtain an initial supply of 12 engines. The Air Force never equipped its orig- inal U-2s with the J75 engines." Detachment C in Japan received the first of these re-engined air- craft, known as U-2Cs, in July 1959, and two more arrived in Turkey for Detachment B in August. All Agency U-2s had the new engines by the summer of 1962, but by then only seven CIA U-2s remained in service. INTERVENTION IN LEBANON, 1958 Although the U-2 was used less and less for its original role of gather- ing strategic intelligence on the Soviet Bloc, it had acquired the new mission of providing US decisionmakers with up-to-date information on crisis situations all around the world. The first use of the U-2 to gather tactical intelligence occurred during the 1956 Suez Crisis. Afterward, U-2s from the Turkish-based Detachment B conducted pe- riodic overflights to monitor the situation in the troubled Middle East, and they became especially active during the summer of 1958. On 15 July 1958, President Eisenhower ordered US troops to land in Lebanon in response to a request for assistance by Lebanese President Camille Chamoun. Three months earlier, Eisenhower had turned down a similar request because the rioting that had led President Chamoun to ask for American aid had died down before in- tervention became necessary. In July, however, President Eisenhower saw the overall situation in the Middle East as much more threaten- ing. On 14 July forces aligned toward Egyptian President Gamal 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.