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 ICBMs, its application has broadened to include shorter-ranged non-nuclear tactical and theater missiles.

The interception technology used has varied over time. In the 1960s, missile defense against ICBMs emphasized nuclear warheads. In recent decades non-nuclear kinetic warheads have been used. Directed-energy weapons such as lasers have been investigated and deployed on a limited basis.

The US, Russia, France, ISRAEL and India have all developed such air defence systems. In the United States, missile defense was originally the responsibility of the Army, but in recent years the Navy and Air Force have developed their own systems.
For more on this subject, go to; http://en.wikipedia.org/wiki/Anti_missile
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Land based version C-RAM in Iraq

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"The U.S. Army's version of the Navy's CIWS Phalanx anti-missile system is called the "Land-Based Phalanx Weapon System" (LPWS). It is a type of "C-RAM" (counter-rockets, artillery and mortars) defensive weapon.

Whereas naval Phalanx systems fire depleted uranium or (more recently) tungsten armor-piercing rounds, the LPWS uses the HEIT-SD (High-Explosive Incendiary Tracer, Self-Destruct) ammunition originally developed for the M163 Vulcan air-defense system. These rounds explode on impact with the target, or upon tracer burnout. With a reliability of between 95 and 99 percent the odds of live rounds falling on "friendlies" is minimal."
http://en.wikipedia.org/wiki/Phalanx_CIWS#Land_based_version