Who Owns Northrop Grumman Defense Systems?

Defense Systems is the youngest of Northrop's four sectors, created in 2018 to absorb the businesses acquired with Orbital ATK. Orbital ATK itself was formed in 2015 from the merger of Orbital Sciences Corporation and Alliant Techsystems, the latter a longtime producer of ammunition, rocket motors, and missile systems for the U.S. military.

The inherited businesses gave Northrop capabilities it had lacked: the Lake City Army Ammunition Plant operating contract, medium and large-caliber ammunition lines, solid rocket propulsion used across the missile market, and the Ground-based Midcourse Defense interceptor program. Northrop folded these into a new Defense Systems sector, initially branded as Innovation Systems on the space side before a 2020 reorganization split the acquired portfolio between Space Systems and Defense Systems.

The sector's flagship program is the Integrated Battle Command System, a networked air and missile defense command system developed for the U.S. Army from a program office in Huntsville, Alabama. IBCS achieved Initial Operational Capability in April 2023 and was approved for full-rate production, and Poland adopted it as the command and control backbone of its air defense modernization, the system's first major international sale.

Rocket motor demand surged after 2022 as the war in Ukraine depleted Western munitions stockpiles. The sector expanded solid rocket motor production capacity significantly, including new facilities in Utah and West Virginia, to meet demand across tactical missiles, interceptors, and space boosters.

In January 2025 the sector realigned, moving strike and surveillance aircraft work to Aeronautics Systems and sharpening its identity around munitions, propulsion, missile defense, and battle command systems.