Huntington Ingalls Industries (HII) is a major American defense contractor and shipbuilding company. It specializes in designing and constructing military ships, including aircraft carriers and submarines, primarily for the U.S. Navy. HII was formed in 2011 through the merger of Northrop Grumman's Shipbuilding sector and Litton Industries. The company operates several shipyards, with its largest facilities located in Newport News, Virginia and Gulfport, Mississippi. HII also provides services related to maintenance, modernization, and repair of naval vessels, contributing significantly to the defense sector and the economy in the regions where it operates.