Orbital ATK was an American aerospace and defense company formed in 2015 through the merger of Orbital Sciences Corporation and ATK. The company specialized in developing and manufacturing space systems, including launch vehicles, satellites, and advanced defense technologies. It played a significant role in various space missions, including supplying the International Space Station. In 2018, Orbital ATK was acquired by Northrop Grumman, becoming part of its innovation in space and defense. The company continued to focus on space exploration, satellite systems, and missile defense, contributing to both commercial and government projects in the aerospace sector.