Boeing B-17 Flying Fortress Boeing B-17 Flying Fortress The Boeing B-17 Flying Fortress is a four-engined heavy bomber developed in the 1930s for the United States Army Air Corps (USAAC). Competing against Douglas and Martin for a contract to build 200 bombers, the Boeing entry (prototype Model 299/XB-17) outperformed both competitors and exceeded the air corps' performance specifications. Although Boeing lost the contract (to the Douglas B-18 Bolo) because the prototype crashed, the air corps ordered 13 more B-17s for further evaluation. From its introduction in 1938, the B-17 Flying Fortress evolved through numerous design advances, becoming the third-most produced bomber of all time,
81st Flying Training Wing (World War II) 81st Flying Training Wing (World War II) The 81st Flying Training Wing is an inactive United States Air Force unit. It was last assigned to the Western Flying Training Command, and was disbanded on 1 November 1945 at the Santa Ana Army Air Base, California. The squadron was a World War II Command and Control unit, its mission was to provide classification and preflight testing of aviation cadets. It was one of three such centers, the others being at Maxwell Field, Alabama and San Antonio Aviation Cadet Center, Texas. There is no lineage between the current United States Air Force