The US has a weapon system that can strike any target with almost any weapon anywhere in the world without being detected by even the best radar systems. The vaunted B-2 Spirit stealth bomber. But despite over thirty years of battle-proven service, the B-2 will not be flying forever. Because of this, the US has been developing its eventual replacement for almost a decade. That replacement, known as the B-21 Raider, will eventually become the Air Force's premier ultra-long-range strike capability