Documents / FOIA release
This is a CIA History Staff monograph by Gregory W. Pedlow and Donald E. Welzenbach, written in 1992 and approved for release in 2011. It covers the CIA's manned overhead reconnaissance program from 1954 to 1974 and its two aircraft, the U-2 and the A-12 OXCART. It follows their development, the overflights of the Soviet Union, the downing of Francis Gary Powers in 1960, and later operations. One section is titled "U-2s, UFOs, and Operation BLUE BOOK."
“Burbank”8 pages
005653421 UNCLASSIFIED 4 May 1967. Chapter 6 304 E0129581.610111>1045Yrs ED 129581.6181161>101010<25Yrs IS) FIRST A-12 DEPLOYMENT: OPERATION BLACK SHIELD Although the Tallinn mission was still being considered in May 1967, another possible employment for the OXCART came under discus- sion. This time the proposal was for OXCART to collect tactical rather than strategic intelligence. The cause was apprehension in Washington about the possible undetected introduction of sur- face-to-surface missiles into North Vietnam. When President Johnson asked for a proposal on the matter, the CIA suggested that the OXCART be used. While the State and Defense Departments were still examining the proposal's political risks, DCI Richard Helms E0129581.6191111,10<25Yrs (Si " Memorandum for DDC1 R. L. Taylor from C. E. Duckett, DDS&T. DS&T records (TS Codeword). UNCLASSIFIED
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FOIA release, from the cia-readingroom 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.