A-26K Counter InvaderDouglas A 26K Counter Invader airplane model. The Counter Invader was a highly modified version of the Douglas A 26 Invader, a World War II attack bomber. Redesignated B 26 in 1948, the Invader served again during the Korean War (1950 1953), mainly as a night intruder against North Korean supply lines. It was removed from service in 1958, but in 1961 the USAF recalled many Invaders for use as tactical bombers in Southeast Asia. Combat duty and two