September marks 60th anniversary of first flight of the Valkyrie
A scale version of the XB-70 Valkyrie inlet with a full-scale YJ93 engine installed is tested in the 16-foot supersonic wind tunnel at Arnold Air Force Base, Tenn., headquarters of Arnold Engineering Development Complex, in 1962. Beginning in the late 1950s and continuing through the mid-1960s, tests were conducted at Arnold Air Force Base, Tenn., headquarters of Arnold Engineering Development Complex, in support of the XB-70 program. Only two Valkyries were built, with only one of the pair remaining. The now-retired aircraft made its first flight on Sept. 21, 1964. (U.S. Air Force photo)
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