The  A-5 was designed to meet a US Navy requirement for a
      high-performance all-weather attack aircraft.  Originally designated
      the A3J, the prototype first flew on 31 August 1958.
      Redesignated the A-5 in 1962, the  Vigilante was capable of delivering a
      nuclear bomb.  Changes in Navy policy cut short the A-5's career as a
      Mach 2 strike aircraft; however, as the  RA-5 the Vigilante was a
      successful reconnaissance aircraft.