Huntington Ingalls Industries, Inc. (HII) owns and operates two segments: Ingalls Shipbuilding and Newport News Shipbuilding. Through HII�s Ingalls segment, it is a supplier and builder of amphibious assault and expeditionary ships to the United States Navy, the builder of National Security Cutters for the United States Coast Guard, and one of the two companies that builds the United States Navy�s fleet of DDG-51 Arleigh Burke-class destroyers. Through its Newport News segment, it is an industrial designer, builder, and refueler of nuclear-powered aircraft carriers, and one of the two companies designing and building nuclear-powered submarines for the United States Navy. It is a full-service provider for the design, engineering, construction, and life cycle support of surface ship programs for the United States Navy. It conducts all of its business with the United States Government, principally the Department of Defense. In January 2014, HII acquired The S.M. Stoller Corporation.