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
243 week later the Viet Cong and North Vietnamese launched their Tet of fensive in South Vietnam. The 303 Committee (the new name for the Special Group after 1964) decided on l February 1968 to suspend a group of overflights scheduled for February and called for mis sion-by-mission approval "during this period of tension." The com mittee approved one additional overflight of southern China, which was flown by Detachment H on 16 March 1968, and two overflights of Cambodia, carried out on 27 March and 3 April 1968 by Detachment G in its first operations since early 1966. These three missions turned out to be the last overflights by U-2s in the Far East. By this time U-2 flights over the PRC had become so dangerous that the State Department opposed further overflights, and on l O April 1968 the 303 Committee decided not to approve any mission that would fly closer than 20 miles from the coast of China. One reason why Detachment H's overflights were stopped was the steady increase in the PRC's ability to track and engage U-2s, as evidenced by its success in downing five U-2s. By 1968 PRC radars along the coast opposite Taiwan were keeping a close watch on U-2 activity from the T'ao-yuan base and actively tracked U-2s as soon as they became airborne. The U-2s then had to face a growing PRC air defense system that not only consisted of SA-2 missiles but also the fast and high~flying MiG-21. The PRC's MiG-21 pilots had become adept at the power-zoom technique and were threatening almost every U-2 mission. The risks to U-2s now seemed too great.65 The decision to end Asian overflights was also rooted in the Johnson administration's change in its whole approach to the war in Indochina in the spring of 1968. On 31 March 1968, the President limited the bombing of North Vietnam in order to improve the chances for peace talks. The end of flights over the People's Republic of China was viewed as another way to improve the peace process. During its six years of overflight operations, Project TACKLE had been extremely active, staging a total of 104 flights over the People's Republic of China (see table, page 244). These missions had brought back huge amounts of data about the PRC but not without a price: five Project TACKLE aircraft had been downed by the PRC, with two of the pilots killed and the other three captured (although later returned). In addition, five other Nationalist Chinese pilots had been killed in training accidents. " OSA. "Chronology of Events Leading to Present Impasse on Resumption of TACKLE Overflights of Mainland China." December 1968, OSA records (TS). Sec, et NOFORl\,I Chapter 5 6eeret
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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.