Boeing YB-40 Flying Fortress Boeing YB-40 Flying Fortress The Boeing YB-40 Flying Fortress was a modification for operational testing purposes of the B-17 Flying Fortress bomber aircraft, converted to act as a heavily armed gunship for other bombers during World War II. At the time of its development, long-range fighter aircraft such as the North American P-51 Mustang were just entering quantity production, and thus were not yet available to accompany bombers all the way from England to Germany and back. Work on the prototype, Project V-139, began in September 1942 by converting the second production B-17F-1-BO (serial number 41-24341) built. Conversion work was
RAF Bomber Command aircrew of World War II Bomber Command during World War II examples being Sergeant Ronald Lewis serving as a wireless operator/air gunner aboard a No. 51 Squadron RAF Armstrong Whitworth Whitley was shot down on 20 July 1940, and Sergeant Gerald Tickner serving as mid upper gunner aboard a No. 640 Squadron RAF Handley Page Halifax shot down on 13 September 1944. A "Main Force" heavy bomber squadron was commanded by an officer holding the rank wing commander who was usually a pilot by trade. Known as "the CO", or commanding officer, he had several flight commanders who reported to him. These men usually held