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,
38th Flying Training Wing (World War II) in advanced (Phase III) two and four engine training, along with bombardier training and before June 1944, glider training. Graduates of the advanced schools were commissioned as Second Lieutenants, received their "wings" and were reassigned to Operational or Replacement Training Units operated by one of the four numbered air fores in the zone of interior. As training requirements changed during the war, schools were activated and inactivated or transferred to meet those requirements. The schools of the wing used a wide variety of planes to support its numerous training needs: 38th Flying Training Wing (World War II) The 38th Flying