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.
“Canberra”11 pages
104 Sec, et NOFORN Chapter 3 detachment had four aircraft working and could average up to two flights per day, Bissell told the President that the crews were "ready and eager to go in beyond the satellites" and overfly the center of the Soviet Union.23 Eisenhower replied that he thought it "urgent" to know whether the recent flights had been tracked by hostile radars. The President was obviously concerned that CIA estimates that the U-2 could fly virtually undetected were proving false. One of the reasons why he had approved the overflight program was the CIA's assurance that the Soviet Union would remain unaware of the flights or-at the very worst-receive only occasional, vague indications. FIRST U-2 FLIGHTS OVER THE SOVIET UNION The question of how well the Soviets could track U-2 flights had not yet been settled when the first overflights of the Soviet Union took place. On Wednesday, 4 July 1956, the U-2 known as Article 347 be gan the first flight over the Soviet Union. Final authorization for mis sion 2013 had come shortly before takeoff. Late on the evening of 3 July, Bissell went to project headquarters in the Matomic Building to give the "Go" or "No go" decision. Although the President had ap proved the overflight, the final decision to start a mission depended on a number of factors, especially the weather over the target area and at the takeoff and landing sites. Bissell made the decision just before midnight Washington time, which was six o'clock in the morning in Wiesbaden. This pattern of last-minute approvals continued for the duration of the U-2 overflight program.2• When Wiesbaden received the "Go" signal, a U-2 equipped with an A-2 camera and flown by pilot Hervey Stockman took off on a course that took it over Poznan, Poland, where riots had occurred on 28-30 June. After Poznan, Stockman headed for Belorussia, where he turned north to Leningrad. The last leg of the mission took the U-2 over the Soviet Baltic states before returning to Wiesbaden. The main target of this mission was the naval shipyards in Leningrad, center of " Andrew J. Goodpaster·s handwritten notes on 2 July 1956 meeting, WHOSS. Alpha. DDEL (TS). ,. Bissell interview by Welzenbach (S); Cunningham interview (TS Codeword). -ieerct
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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.