September marks 60th anniversary of first flight of the Valkyrie
Pilots who were to perform the first test flights for the XB-70 Valkyrie operate the YJ93 engine, the powerplant of the XB-70, while the engine is tested under simulated flight conditions in May 1964 in the Rocket Test Facility at Arnold Air Force Base, Tenn., headquarters of Arnold Engineering Development Complex. This was done to help the pilots familiarize themselves with the performance characteristics of the engine prior to the first XB-70 flight, which occurred on Sept. 21, 1964. Beginning in the late 1950s and continuing through the mid-1960s, tests were conducted at Arnold AFB in support of the XB-70 program. Only two Valkyries were built, with only one of the pair remaining. (U.S. Air Force photo)
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