Orbital ATK

Orbital ATK Inc. is an American aerospace manufacturer and defense industry company. It was formed in 2015 from the merger of Orbital Sciences Corporation and parts of Alliant Techsystems.

Orbital ATK has a contract to develop the four-segment Space Shuttle Solid Rocket Booster into the five-segment boosters for the Space Launch System.

History
A merger of Orbital Sciences Corporation and the defense and aerospace divisions of Alliant Techsystems (ATK) was announced on April 29, 2014. The two companies had collaborated on several previous projects, including the use of 400 ATK rocket motors in Orbital's launch vehicles. The deal officially closed on February 9, 2015. ATK's sporting-goods division spun off to form Vista Outdoor on the same day.

Flight Systems Group
Based in Chandler, Arizona, the Flight Systems Group includes the Pegasus, Minotaur, and Antares launch vehicles as well as solid-propulsion and aerostructures programs.

Defense Systems Group
The Defense Systems Group, based in the Baltimore, Maryland area, produces tactical missiles, defense electronics, and medium- and large-caliber ammunition.

Space Systems Group
Orbital ATK's Space Systems Group provides satellites for commercial, scientific, and security purposes. This group also produces the Cygnus spacecraft, which delivers cargo to the International Space Station. The group is based at the company's headquarters in Dulles, Virginia