ATK Defense Group is an industry leader in ammunition, precision and strike weapons, missile-warning solutions, and tactical rocket motors across air, sea and land-based systems. The group is the largest U.S. producer of small-caliber ammunition, as well as a leading producer of medium- and large-caliber ammunition and medium-caliber gun systems. ATK Defense develops advanced capabilities for missle-defense interceptors, fuzzing and warheads, weapon zed special –mission aircraft and propulsion/controls. The group also brings extensive experience and expertise in defense facility management and modernization.

ATK Defense Group encompasses four divisions:
Armament Systems
Defense Electronic Systems
Missile Products
Small Caliber Systems