North American XB-70A Valkyrie Published on June 7, 2012 in 8 June 1966Full resolution (1368 × 956) ← Previous Next → The XB-70A leading a formation of aircraft powered by GE engines. Joe Walker’s F-104 is just below the right wing tip. (U.S. Air Force)North American XB-70A Valkyrie in formation. (U.S. Air Force photo)