The submarine industrial base will have to expand in order to simultaneously build Ohio-class replacement ballistic missile submarines and Virginia-class attack submarines with a payload module. General Dynamics Electric Boat and Huntington Ingalls Industries -- Newport News Shipbuilding, the only two remaining submarine shipbuilders in the United States, have identified facility projects necessary to support the demand of simultaneous construction, according to an April report penned by Navy acquisition chief Sean Stackley. The report, viewed by Inside the Navy ,...