A major sensor for the Missile Defense Agency's ground-based midcourse defense program (GMD), the Sea-Based X-Band Radar (SBX) will provide the capability to track ballistic missiles and their warheads, discriminate among various objects in flight, and provide data for intercepting targets and their destruction. The addition of the SBX to MDA's missile defense system is another key milestone toward the evolution of a layered and integrated Ballistic Missile Defense System (BMDS).