The A-4 was not operational until AFTER the Korean War, making it's very first flight in 1954.
*looks up and reads again*
Did I say "Korean War", or "Korean War era"?
The aircraft was designed during the war, and was typical of most aircraft designed and used during that conflict.
So I will stick by my statement it was Korean War era. Just as the F-16 is a Vietnam War era fighter.