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Missile defense is a system, weapon, or technology involved in the detection, tracking, interception, and destruction of attacking missiles. Originally conceived as a defence against nuclear-armed Intercontinental ballistic missiles, its application has broadened to include shorter-ranged non-nuclear tactical and theater missiles. The United States, Russia, France, India, and Israel have all developed such air defense systems. In the United States, missile defense was originally the responsibility of the Army. The U.S. Missile Defense Agency has developed maritime systems and command and control that will eventually be transferred to the Navy and Air Force for operation and sustainment. (via Freebase)