North American XB-70A Valkyrie 62-0001 USAF | Johnny Comstedt
The proposed fleet of B-70 deep penetration nuclear bombers was cancelled in 1961 due to high costs and the introduction of ICBMs, but two prototypes of this awesome six-engined Mach 3 beauty were used in supersonic test flights from 1964 to 1969. One crashed following a midair collision with an F-104 while filming in 1966.