Documents / Official release
This is a Secret History Staff monograph by Gregory W. Pedlow and Donald E. Welzenbach of the Central Intelligence Agency, published in 1992. It gives a history of the CIA's manned overhead reconnaissance program from 1954 to 1974, covering the development and operation of the U-2 and the A-12 OXCART aircraft. It covers overflights of the Soviet Union, the 1960 downing of Francis Gary Powers, and later operations. One section is titled "U-2s, UFOs, and Operation BLUE BOOK."
From the source:Release of 2026-06-12 This CIA History Staff document chronicles the complete history of the U-2 and OXCART (A-12) high-altitude reconnaissance aircraft programs from 1954 to 1974, detailing their development, operations over the Soviet Union and other targets worldwide, the famous downing of Francis Gary Powers in 1960, organizational reforms following that incident, and the eventual transfer of operations from CIA to Air Force control. A more redacted version of this document has been available on CIA's public website.
“The Advance”34 pages
101 Following the success of this first mission, Bissell was eager to begin overflights of the Soviet Union. But even after the President granted his approval on 21 June, such missions could not yet take place for two reasons. First, President Eisenhower had agreed with a CIA and State Department recommendation that West German Chancellor Konrad Adenauer be informed in advance of US plans to overfly the Soviet Union from bases in Germany (in keeping with ex isting policies Adenauer was not informed about overflights of Eastern Europe). Second, Soviet party chief Nikita Khrushchev had invited representatives of the US Air Force to the Moscow Air Show, which opened on 23 June 1956. Led by Air Force Chief of Staff Nathan F. Twining, the delegation would be in the Soviet Union for a week, and General Twining requested that no overflights of the Soviet Union be staged until the Air Force delegation had left.11 Both of these restrictions on overflights of the Soviet Union were cleared up by the end of June. Accompanied by General Cabell and the Chief of Station for Germany, Tracy Barnes, Bissell briefed Chancellor Adenauer and his trusted adviser, State Secretary Hans _ Globke, on 27 June. Adenauer enthusiastically endorsed the project.11 A few days later the Air Force delegation returned from Moscow, but now unfavorable weather prevented the start of opera tions against the Soviet Union. While waiting for the clouds over the Soviet Union to clear, Detachment A carried out two more overflights of Eastern Europe on 2 July 1956: mission 2009 over Czechoslovakia, Hungary, and Bulgaria; and mission 2010 over East Germany, Poland, Hungary, and Romania. That afternoon Bissell and DDCI Cabell gave President Eisenhower a detailed briefing on the first U-2 overflight, which the President found "very interesting, very positive." Eisenhower was anxious to know, however, whether radars had tracked the aircraft. Bissell replied that, although East European radars had picked up the 20 June flight, radar operators had misread the altitude as only 42,000 feet. He added that the Agency was awaiting reports on that morn ing's flights to see if they, too, had been detected. Noting that the U-2 " Nathan F. Twining, Neither Liberty nor Safety (New York: Holt, Rinehart & Winston, 1966), pp. 259-260; OSA History, chap. 11, p. 27 (TS Codeword). "' OSA History, chap. 11. p. 28 (TS Codeword). 6eeret NOFGRN Chapter 3 ~eeret
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Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 406 pages are in the text index: search them above, or from the library's search.