XB-70 Valkyrie - US AIR FORCE (USAF)

The North American Aviation XB-70 Valkyrie was the prototype of the B-70 nuclear-armed, deep-penetration strategic bomber for the United States Air Force Strategic Air Command. In the late 1950s, North American Aviation designed the Valkyrie bomber as a large, six-engined aircraft capable of reaching Mach 3 while flying at 70,000 feet (21,000 m). The USAF eventually gave up fighting for its production and the B-70 program was canceled in 1961. Development was then turned over to a research program to study