The USAF had planned to redesignate the A-12 aircraft as the B-71 as the successor to the B-70 Valkyrie, which had two test Valkyries flying at Edwards AFB, California. The B-71 would have a nuclear capability of 6 bombs. The next destination was RS-71 (Reconnaissance-Strike) when the strike capability became an option. However, then USAF Chief of Staff Curtis LeMay preferred the SR designation and wanted the RS-71 to be named SR-71. Before the Blackbird was to be announced by President Johnson on February 29, 1964, LeMay lobbied to modify Johnson's speech to read SR-71 instead of RS-71. The media transcript given to the press at the time still had the earlier RS-71 designation in places, creating the myth that the president had misread the plane's designation.
Viz Wikipedia a
http://www.designation-systems.net/usmilav/nonstandard-mds.html#_MDS_SR71
http://web.archive.org/web/20040511165801/http://www.aviationnow.com/content/publication/awst/20010319/avi_lett.htm
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