https://www.youtube.com/watch?v=bTq4Qz7Ajwc

The North American XB-70 Valkyrie was the largest and fastest bomber ever built by the United States, but the massive six-engine Mach 3.0-capable jet never entered production. Only one surviving prototype sits in a museum in Dayton, Ohio, even as the Boeing B-52 it was supposed to one day replace continues to soldier on.The idea behind the XB-70 originated in the 1950s when it was assumed ever-greater speeds and altitudes would enable American bombers to survive against Soviet air defenses unmolested on their way to delivering their doomsday payloads. At the time, the only effective defense against bombers were fighters and antiaircraft artillery. Even then, anti-aircraft guns were only marginally effective and interceptors were increasingly challenged by ever improving bomber performance.The XB-70, while a technological wonder at the time, was the wrong plane for the wrong time. It came at a time when ballistic missiles were thought to be supplanting manned bombers. Moreover, it was being developed at a time when it was increasingly apparent that high speed and high altitude were not sufficient protection against surface-to-air missiles or the next generation of Soviet fighters.But the nail in the coffin was the jet’s exorbitant price tag and lack of mission flexibility—the B-70 couldn’t be adapted for the low level role. Let’s hope today’s shadowy Long Range Strike Bomber fares better.All the information in this video came from the:https://nationalinterest.org/blog/reb…