The United States Air Force has just approved the second and third basing locations for the Northrop Grumman B-21 Raider. The B-21 Raider is the United States’ newest strategic bomber and is expected to first replace the Rockwell B-1 Lancer before eventually replacing the B-2 Spirit bomber. While not yet in service, the Raider is now at a low production rate and is expected to enter service at the end of the decade.