Valkyrie was an experimental U.S. nuclear bomber developed in the 1950s and 1960s as a potential replacement for the B-52.

Exemplifying the period was the North American XB-70 Valkyrie, a supersonic bomber with impressive specifications and a cult-like place in the annals of aviation history. Designed in the early 1960s ...

The Air Force also built the Convair B-58 Hustler to compete with the B-52 (the first operational bomber capable of Mach 2).

It was the "largest and fastest bomber" that the US ever built, according to The National Interest. The XB-70 Valkyrie could cruise at Mach 3, riding its own shock wave to do so, and could hit ...