Alliant Techsystems, often referred to as ATK, was an American aerospace and defense company. Founded in 1990, it specialized in producing ammunition, missile systems, and other defense-related products. The company played a significant role in supporting military operations and was known for its innovative technologies in the defense sector. In 2015, ATK merged with Orbital Sciences Corporation to form Orbital ATK, which further expanded its capabilities in aerospace and defense. The new entity focused on space systems, satellite technology, and advanced weaponry, continuing the legacy of ATK in providing critical support to the U.S. military and allied forces.