Northrop Grumman Corporation is an American multinational aerospace and military technology firm. It is a major producer of military equipment and weaponry across the globe. The company's four primary business divisions are Aeronautics Systems, Defense Systems, Mission Systems, and Space Systems. The B-21 Raider, a long-range, stealthy strategic bomber that can deliver both conventional and nuclear missiles, is presently being developed by Northrop Grumman. It will eventually replace Northrop's B-2 Spirit, the only known stealth bomber. Additionally, it was the only bidder on the Air Force's Ground Based Strategic Deterrent program, which intends to create a new intercontinental ballistic missile.