
Forget the B-21 Raider: The XB-70 Valkyrie Could Hit Mach 3, But the Air Force Said No Thanks
The North American XB-70 Valkyrie, a Cold War-era bomber, was a technological marvel designed to fly at Mach 3 and at 70,000 feet, circumventing Soviet air defenses through speed and altitude. Initially conceived as a replacement for the B-52, the Valkyrie …