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The XB-70 Valkyrie was a Mach 3 bomber developed by North American Aviation for the U.S. Air Force, intended to replace the B-52 Stratofortress. Its first flight was in September 1964, but the program ended after a 1966 mid-air collision destroyed one prototype.

Changing military tactics and the rise of Soviet surface-to-air missiles diminished the bomber's strategic value. Ultimately, the Air Force canceled the production of the B-70 in 1961, with only two prototypes built.

The surviving Valkyrie provided valuable research data until 1969 and is now housed at the National Museum of the U.S. Air Force.