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.
“Hill”15 pages
97 Even though President Eisenhower had approved every stage of the U-2's development, knowing full well that the aircraft was being built to fly over the Soviet Union, the actual decision to authorize such flights was very difficult for him. He remained concerned that overflights could poison relations with the Soviet Union and might even lead to hostilities. One argument that helped overcome the President's reluctance was the CIA's longstanding contention that U-2 flights might actually go undetected because Soviet radars would not be able to track aircraft at such high altitudes. This belief was based on a 1952 study of Soviet World War II-vintage radars and on 1955 tests using US radars, which-unknown to US officials-were not as effective as Soviet radars against high-altitude targets. Shortly before U-2 operations began, however, the CIA's Office of Scientific Intelligence (OSI) conducted a vulnerability study of the U-2 that was published on 28 May 1956. The study's conclusion was that "Maxi mum Soviet radar detection ranges against the Project aircraft at ele vation in excess of 55,000 feet would vary from 20 to 150 miles.... In our opinion, detection can therefore be assumed." The OSI study added, however, "It is doubtful that the Soviets can achieve consis- . tent tracking of the Project vehicle." 9 Completed just thr~e weeks be fore the initation of overflights, this study seems to have had little impact on the thinking of the top project officials. They continued to believe that the Soviets would not be able to track the U-2 and might even fail to detect it, except for possible vague indications. 10 Soviet radars were not President Eisenhower's only concern. Also fearing that a malfunction might cause a U-2 to crash inside the Soviet Union, he asked Allen Dulles what the consequences would be. The President's staff secretary, Col. Andrew J. Goodpaster, who was present at virtually all White House meetings on the U-2 project and served as the President's intermediary to the CIA on this issue, later recalled: Allen '.s approach was that we were unlikely to lose one. If we did lose one, the pilot would not survive. . . . We were told-and it was part of our understanding of the situation-that it was al most certain that the plane would disintegrate and that we could • OSA Histor;,; chap. 11, p. 31 (TS Codeword). For the belief that the U-2 might go unde tected see the Leghorn interview and Dwight D. Eisenhower, Waging Peace. 1956-1961 (New York, 1965), p. 41. "' Richard M. Bissell, Jr., interview by Gregory W. Pedlow, tape recording, Farmington, Connecticut. 28 October I988 (S). Sec, et NOFORN Chapter 3 Secaet
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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.