Douglas built 2,503 A-26/B-26 Invaders. During production a number of modifications were progressively introduced so that by 1948, the A-26 was one of the few wartime aircraft types still in service with the post-war U.S. Air Force. When the famous Martin B-26 Marauder retired and the Air Force deleted the designation "A" (for attack category), the Douglas Invader took on the B-26 designation.