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
American music during World War II American music during World War II American music during World War II was considered to be popular music that was enjoyed during the late 1930s (the end of the Great Depression) through the mid-1940s (through the end of World War II). By 1940, 80% of American households would own a radio; making American music easier to listen to as opposed to the World War I era. Therefore, popular songs from the World War II era were far more accessible to the civilians and soldiers alike and thus were better able to build morale than before. Unlike many World War I