The North American XB-70 Valkyrie emerged from a United States Air Force requirement in the mid-1950s for a bomber capable of delivering nuclear payloads at speeds and altitudes beyond the reach ...
A unique bomber-style fighter jet, the North American XB-70 Valkyrie has a top speed of around 2,050 mph, which is about Mach 3, depending on the altitude. This experimental fighter never ...
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