PBJ (B-25) USMCNorth American PBJ USMC airplane model. During World War II, the U. S. Navy (USN) acquired 706 North American Aviation (NAA) B 25 Mitchell medium bombers from the U. S. Army Air Forces (USAAF). These aircraft, designated PBJ by the USN, equipped a total of sixteen U. S. Marine Corps (USMC) bombing squadrons during the war, eight of which served in the Pacific. Mahogany Wood. Scale: 1 48. Wingspan 16 1 2 inches, Length 13 1 2 inches.