The North American Aviation XB-70 Valkyrie was the prototype version of the planned B-70 nuclear-armed, deep-penetration supersonic strategic bomber for the United States Air Force Strategic Air Command. Designed in the late 1950s by North American Aviation (NAA), the six-engined Valkyrie was capable of cruising for thousands of miles at Mach 3+ while flying at 70,000 feet (21,000 m). Other videos you might like: This is America's E-6 Mercury ► https://youtu.be/ZZRH-k4TUuQ Why America's Enemies Feared the P-47 ► https://youtu.be/bYssexVvggA America's Crazy Flying Aircraft Carrier ► https://youtu.be/EgbgIOThb4E