title: Huntington Ingalls Industries
context: HII is the sole designer, builder, and refueler of nuclear-powered aircraft carriers in the United States. It is one of two nuclear-powered submarine builders (the other being General Dynamics Electric Boat). 70% of the current, active U.S. Navy surface fleet has been built by HII's former units.[7]
question: Who builds ships for the US Navy?
answers: HII