ATK -They are also a defense company as well. Alliant Techsystems Inc. (ATK) is an aerospace, defense, and commercial products company that operates in 22 states, Puerto Rico, and internationally. The Company operates in four segments: aerospace systems, armament systems, missile products, and security and sporting. The Company is a producer of military small-caliber ammunition for use in soldier-carried weapons, such as automatic and semi-automatic rifles, and machine guns. ATK is also a producer of medium-caliber ammunition used by tanks. In addition, the Company is a producer of ammunition for the sport enthusiast and law enforcement markets. ATK is a manufacturer of solid rocket motors, supporting tactical, strategic, missile defense, and space launch applications. ATK is a provider of composite components for commercial and military aircraft, as well as precision-strike weapon systems. The Company manufactures medium-caliber chain guns for use on a variety of land, sea and airborne platforms.