Not many people know that the US Marine Corps flew bombers in WWII. One of the missions of the Devil Dog Squadron is to keep that piece of history alive. PBJs came about by chance. In 1943, North American, the B-25's manufacturer, produced more B-25s than the Army Air Corp could use. Approximately 800 of the airplanes were offered to the US Navy. Although the famous Doolittle Raid was a successful carrier launched formation of B-25s, the Navy had little use for the extra airplanes. They were too large for regular carrier duty.