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D-558-2 being mounted to P2B 1S launch aircraft, USA, 1953. The Douglas D-558-2 2 Skyrocket (NACA 144), prior to flight, being towed under the P2B-1S (Navy designation for the Air Force B-29) launch vehicle (NACA 137) for attachment. The tail of the Skyrocket is almost aligned with the opening cut to fit in the bottom of the P2B-1S. The photograph also shows the large hydraulic jacks used to elevate the P2B-1S launch vehicle. The Douglas D-558-2 "Skyrockets" were among the early transonic research airplanes like the X-1, X-4, X-5, and X-92A. Three of the single-seat, swept-wing aircraft flew from 1948 to 1956 in a joint program involving the National Advisory Committee for Aeronautics (NACA), with its flight research done at the NACA's Muroc Flight Test Unit in California, redesignated in 1949 the High-Speed Flight Research Station (HSFRS). Also partners in the flight research were the Navy-Marine Corps and the Douglas Aircraft Co. D-558-2 being mounted to P2B 1S launch aircraft, USA, 1953. Creator: Unknown. (KEYSTONE/HERITAGE IMAGES/HERITAGE SPACE)