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The XB-70 was the prototype version of the B-70 nuclear-armed deep penetration strategic bomber for the US. The B-70 program was subsequently cancelled and only two XB-70 Valkyries were produced during the period 1964 to 1969. The six-engine Valkyrie was capable of cruising for thousands of kilometers at over Mach 3 at altitudes of 21,000 meters.