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 Pentagon”12 pages
240 Secret NOFORl'3 Chapter 5 With their demands met, Nationalist Chinese officials again con sented to overflights by Detachment H, and operations resumed in February 1965 with three missions over the mainland. By this time US interest in the People's Republic of China was very high because of the PRC's development of nuclear weapons. The Special Group, therefore, approved an extensive reconnaissance program directed against the PRC. By the end of the year, Detachment H had flown 30 missions, the highest annual total during the entire program. The level of activity declined during 1966, with only IO missions flown over the mainland. Detachment H also suffered the loss of two more aircraft and pilots in crashes during training missions in 1966. In the fall of that year, joint US-Nationalist Chinese relations in the field of overhead reconnaissance were further strained by the unilat eral US decision to kill the longstanding program of low-altitude nighttime overflights of the mainland (STPOLLY).61 " Ibid., chap. 19. annex 120, pp. 22-24; chap. 17. p. 69 (TS Codeword). -Sesret..
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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.