| Douglas A-4 Skyhawk Vietnam War
U.S. NavyA-4B (A4D-2) - strengthened aircraft and added air-to-air refueling capabilities, improved navigation and flight control systems, provision for AGM-12 Bullpup missile; redesignated A-4B in 1962, 542 built.
A-4C (A4D-2N) - night/adverse weather version of A-4B, with AN/APG-53A radar, autopilot, LABS low-altitude bombing system. Upgraded engine; redesignated A-4C in 1962, 638 built.
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