Escort version of the B-17F with extra guns. The flaw in the idea was the heavy YB-40s could not keep up the bombers once relieved of their bomb loads. The 21 pre-production YB-40s were withdrawn after only 14 missions. 42-5736, at one time called Tampa Tornado, was flown back to the US for scrapping. Photo from: National Archives at College Park, Maryland
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