USS John C. Calhoun
USS John C. Calhoun (SSBN-630), a James Madison-class fleet ballistic missile submarine, was the only ship of the United States Navy to be named for John C. Calhoun (1782–1850), the Democratic legislator and statesman. == Construction and commissioning == The contract to build John C. Calhoun was awarded to Newport News Shipbuilding and Dry Dock Company in Newport News, Virginia, on 20 July 1961 and her keel was laid down there on 4 June 1962.