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
Sceret NOFORN Chapter 3 126 Although the U-2 overflights of Eastern Europe in late 1956 caused renewed Soviet protests, the sharpest protest came on 15 December 1956, after three specially modified USAF RB-57D bomb ers photographed the city of Vladivostok in a high-speed dash over the Far Eastern coast of the Soviet Union (as part of the Air Force's Operation BLACK KNIGHT). President Eisenhower had approved the mission after being told by the Air Force that the high-speed RB-57Ds would probably not be detected.66 Reacting strongly to the Soviet protest. the President told Secretary of State Dulles on 18 December that he was going to "order complete stoppage of this entire business." As for a reply to the Soviet protest, Dulles said, "I think we will have to admit this was done and say we are sorry. We cannot deny it." Dulles noted that "our relations with Russia are pretty tense at the moment." Eisenhower agreed, noting that this was no time to be provocative. He then instructed Colonel Goodpaster to call Secretary of Defense Wilson, Joint Chiefs of Staff Chairman Radford, and DCI Dulles to order: "Effective immediately, there are to be no flights by US recon naissance aircraft over Iron Curtain countries." 67 Flights along the borders of Iron Curtain countries continued, however, and, on 22 December 1956, Detachment B flew the first mission (4019) by a U-2 equipped for electronic intercept. The elec tronic-detection equipment known as the System-V unit (see appendix C) was installed in the bay normally used by the main camera, and the plane flew along the Soviet border from the Black Sea to the Caspian Sea and on to Afghanistan. The System-V unit worked well.68 Early in 1957, a mission along the Soviet border accidentally turned into an overflight. On 18 March 1957, a U-2 collecting elec tronic intelligence along the Soviet southern border entered Soviet •~ Goodpaster interview (S). '' Telephone calls 18 December 1956. DDE Diary. DDEL. (U); Andrew J. Goodpaster. Memorandum for the Record, 18 December l956. WHOSS. Alpha. DDEL (TS. down graded to S); the Soviet protest note of 15 December 1956 and the U.S. reply of I I January 1957 are contained in .. Alleged Overflight of Soviet Area by American Planes ... US Department of Stare Bulletin. vol. 36. 28 January l 957. p. 135. Although Dulles"s ini tial inclination had been to offer an apology. the U.S. reply stated that the "only autho rized United States Air Force flights in the general area of the Sea of Japan were normal training activities." .. Mission folder 4019 (22 December 1956). OSA records. job 67-B-972, box 7 (TS Codeword). Sec,et
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Official release, from the pursue 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.