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
148 Secret NOFORN Chapter 3 shoot down a U-2. Before the program started, Richard Bissell had estimated that the U-2 would be able to fly over the Soviet Union with impunity for only about two years. This period was already over, and the Soviets were working frantically to devise a means to stop U-2 overflights. From the very beginning, Soviet air defense units had not only tracked U-2s with radars, but had also made repeated efforts to shoot them down with antiaircraft weapons and interceptor aircraft. In 1956 such attempted interceptions had involved primarily MiG-15s and MiG- l 7s, which could barely reach 55,000 feet. The advent of MiG- l 9s and MiG-21 s, which could climb even higher, provided a greater threat for U-2 pilots. Realistic training for pilots learning to intercept the U-2 became possible after the Soviets developed a new high-altitude aircraft, the Mandrake, which was actually an improved version of the Yakovlev-25 all-weather interceptor. The Mandrake used a high-lift, low-drag wing design similar to that employed by the U-2, but its twin engines made it heavier. The Mandrake's operating altitude was 55,000 to 65,000 feet, and its maximum altitude was 69,000, far less than the 75,000 feet reached by the U-2. Like the U-2, the Mandrake's wings would not tolerate great stresses, so it could not be used as an attack aircraft at the high altitudes at which both planes operated. Between 1957 and 1959, Yakovlev built 15 to 20 of these aircraft in two versions: the Mandrake-R or YAK-25RM and the Mandrake-T, sometimes called the YAK-26. These high-altitude air craft were used to overfly the Middle East, India, China, and Pakistan, as well as border regions of NATO nations in Europe during the late 1950s and early I 960s. It is not believed that Mandrakes ever attempted to overfly the continental United States."'-' Beginning in late 1957, the Mandrake served as a practice target for pilots of high-performance Soviet MiG-19 and MiG-21 intercep tors. The Soviet technique that most concerned U-2 pilots was the "snap up" or power dive and zoom climb. In this maneuver, ground-based radar operators would direct the interceptor aircraft along the same flight path as the U-2. When the MiG pilot achieved the same compass heading as the U-2 flying more than 10,000 feet above him, he would put his aircraft into a shallow dive to pick up 01 ' "Yakovlev Yak-25RM Mandrake," Jane's Defence Weekly, vol. 3, no. 7, 16 February 1985. Seeret
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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.