This photograph taken in 1956 shows the first of three R4D Skytrain aircraft on the ramp behind the NACA High-Speed Flight Station.
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This photograph taken in 1956 shows the first of three Douglas R4D Skytrain aircraft on the ramp behind the NACA High-Speed Flight Station. Note the designation “United States NACA” on the side of the aircraft. NACA stood for the National Advisory Committee for Aeronautics, which evolved into the National Aeronautics and Space Administration (NASA) in 1958.May 2, 1956NASA Photo / NASA› R4D Project Description