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
7 was only 64,000 feet. Meanwhile Leghorn, frustrated by the rejection of his original concept, had transferred to the Pentagon in early 1952 to work for Col. Bernard A. Schriever, Assistant for Development Planning to the Air Force's Deputy Chief of Staff for Development.~ In his new position Leghorn became responsible for planning the Air Force's reconnaissance needs for the next decade. He worked closely with Charles F. (Bud) Wienberg-a colleague who had fol lowed him from Wright Field-and Eugene P. Kiefer, a Notre Dame-educated aeronautical engineer who had designed reconnais sance aircraft at the Wright Air Development Center during World War IL All three of these reconnaissance experts believed that the Air Force should emphasize high-altitude photoreconnaissance. Underlying their advocacy of high-altitude photoreconnaissance was the belief that Soviet radars would not be able to track aircraft flying above 65,000 feet. This assumption was based on the fact that the Soviet Union used American-built radar sets that had been sup plied under Lend-Lease during World War II. Although the SCR-584 (Signal Corps Radio) target-tracking radar could track targets up to 90,000 feet. its high power consumption burned out a key component quickly, so this radar was normally not turned on until an early warn ing radar had detected a target. The SCR-270 early warning radar could be left on for much longer periods and had a greater horizontal range (approximately 120 miles) but was limited by the curvature of the earth to a maximum altitude of 40,000 feet. As a result, Leghorn, Kiefer, and Wienberg believed that an aircraft that could ascend to 65,000 feet before entering an area being swept by the early warning radar would go undetected, because the target-tracking radars would not be activated.9 The problem with this assumption was that the Soviet Union, un like Britain and the United States, had continued to improve radar technology after the end of World War II. Even after evidence of im proved Soviet radar capabilities became available, however, many ad vocates of high-altitude overflight continued to believe that aircraft flying above 65,000 feet were safe from detection by Soviet radars. ' Leghorn interview (S). ' Ivan A. Getting, interview by Donald E. Welzenbach, Los Angeles, 28 August 1988 (U). Sec,et NOFORN Chapter 1 SeeFet
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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.