Counter rocket, artillery, and mortar, abbreviated CRAM, is a set of systems used to detect and/or destroy incoming rockets, artillery, and mortar rounds in the air before they hit their ground targets, or simply provide early warning.

The intercept capability of CRAM is effectively a land version of weapons such as the Phalanx CIWS radarcontrolled rapidfire gun for closein protection of vessels from missiles; either weapon system also uses a forwardlooking infrared camera to allow a defender to visually identify these target threats before engaging the targets.

One major difference between the land and seabased variants is the choice of ammunition. Whereas naval Phalanx systems fire tungsten armorpiercing rounds, the CRAM uses the 20mm ammunition, originally developed for the M163 Vulcan air defense system. These rounds explode on impact with the target, or on tracer burnout, thereby greatly reducing the risk of collateral damage from rounds that fail to hit their target.

CRAM: An Advanced Automated PointDefense Gatling Gun

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