During the late 1930s an armament race developed between bombers and the fighters that were bent on stopping them. The development of multi-engined, multi-gun, all-metal bombers forced a corresponding increase in fighter armament which, in turn, led to further attempts to improve bomber armament to ensure its ability to survive in the face of hostile fighters. The US Army Air Corps (USAAC) requested that powered gun turrets be fitted to its two principal...
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