Ingalls Shipbuilding
Huntington Ingalls Industries
Newport News Shipbuilding
Northrop Grumman
National Steel and Shipbuilding Company
Lockheed Martin
Austal USA
Vigor Shipyards
General Dynamics
Bath Iron Works
Former business division of Northrop Grumman
northropgrumman.com
Northrop Grumman Ship Systems was a former sector or division of Northrop Grumman Corporation which was responsible for building small and medium shipping products. Wikipedia