Boeing B-17 Flying Fortress NAN10-50.jpg|thumb|B-17 modified for testing of the [[Pratt & Whitney T34|XT-34 turboprop]]. When testing concluded, the aircraft was restored to stock configuration as the "[[Liberty Belle (B-17)|Liberty Belle]]", but was lost in a post-forced-landing fire near [[Oswego, Illinois]] on 13 June 2011.]] [[Category:Boeing aircraft|B-17 Flying Fortress]] [[Category:United States bomber aircraft 1930–1939]] [[Category:Four-engined tractor aircraft]] [[Category:Low-wing aircraft]] [[Category:World War II bombers of the United States]] [[Category:Boeing B-17 Flying Fortress| ]] [[Category:Aircraft first flown in 1935]] 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
RAF Bomber Command aircrew of World War II some air gunners were commissioned officers of which a small number were considerably older than most aircrew and even veterans of World War I. An Air Gunner wore a single-winged aircrew brevet with a wreath containing the letters AG on his tunic, above his left breast pocket denoting his trade specialization and very early in the war might also have the brass "winged bullet" qualification badge of a pre-war air gunner on his sleeve. Typically when flying operationally the following aircraft were crewed as below: Fairey Battle single-engined light bomber – most often used in daylight operations in a ground