Not every experimental jet fighter made by the U.S. military would go on to reach production, for any number of reasons.

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Entering service in 1940, the Focke-Wulf Fw190 was one of Germany's widely produced planes and was the country's only fighter plane powered by a radial engine. In its base configuration ...

While the B-17 helped win World War II and could defend itself with its 13 machine gun placements, they weren't nearly as agile as smaller fighter planes and were vulnerable without escort planes.