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.
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176 Sec.et rdOFOAN Chapter 4 code letters JGOHB, JGOHB as they tuned from one prearranged fre quency to the other. Then one of the Peshawar operators decided to tune in the guard frequency where the Morse transmission was stron gest. He was able to discern a break in the letters, making the mes sage read "HBJGO HBJGO." The Peshawar operators realized this stood for "HBJARGON Go." The detachment chief, Col. William Shelton, who had been waiting anxiously inside the radio van for a "Go" or "No Go" message, leaped from the van and ran across the field to give the signal for takeoff to Powers, who was sitting in the U-2C at the end of the runway. 28 Powers started his takeoff roll at Ol 59Z on l May 1960. Once airborne, Powers guided his aircraft toward Afghanistan. Following standard operating procedure, Powers clicked his radio switch when he reached penetration altitude of 66,000 feet, which signaled the op erations unit at Peshawar that everything aboard the aircraft was working and the mission would proceed as planned. Aside from this simple signal, Powers and all U-2 pilots maintained strict radio si lence during penetration missions. Powers' first target was- the Tyuratam Missile Test Range after which he headed for Chelyabinsk, just south of Sverdlovsk. The planned route would take him over Kyshtym, Sverdlovsk, northwest to Kirov. north over Yur'ya and Plesetsk, then to Severodvinsk. north west to Kandalaksha, north to Murmansk, and, finally, west to Bodo, Norway. May Day turned out to be a bad time to overfly the Soviet Union. On this major holiday, there was much less Soviet military air traffic than usual, so Soviet radars could easily identify and track Powers' U-2. In addition, the Soviets responded to the intrusion by ordering a ban on civilian air traffic in a large portion of the Soviet Union. Soviet radar began tracking the U-2 when it was still 15 miles south of the Soviet-Afghan border and continued to do so as the air craft flew across the Central Asian republics. When Powers reached the Tashkent area, as many as 13 Soviet interceptor aircraft scrambled in an unsuccessful attempt to intercept his plane. Powers never made it past Sverdlovsk. Four and a half hours into the mission, an SA-2 surface-to-air missile detonated close to and just behind his aircraft and disabled it 70,500 feet above the Sverdlovsk '·' Richard K. Pero, "Message Received-Unfortunately," Studies in Intelligence 27 (Winter 1983 ):29 (S). Sec,et
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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.