The new B-21 stealth bombers are designed to fly thousands of miles away, slip undetected through enemy air defenses, drop several tons of bombs on targets and clear the way for U.S. and allied militaries. Only the B-2 can currently do that, and the U.S. owns just a handful.
The Air Force will likely acquire more than 100 of the stealth bombers, which are capable of launching nuclear strikes around the world.
The B-21 Raider, which is currently in the prototype testing stage, will likely replace many of the aging bombers in the US Air Force such as the B-52 Stratofortress, B-1B Lancer, and B-2 Spirit.