X-1 was the United States Navy's only midget submarine (but see the NR-1 Deep Submergence Craft), laid down on 8 June 1954, at Deer Park, Long Island, New York, by the Engine Division of Fairchild Engine and Airplane Corporation, launched on 7 September 1955, at Oyster Bay, Long Island, by Jakobson Shipyard; delivered to the Navy on 6 October at New London, Connecticut, and placed in service on 7 October 1955, with Lieutenant Kevin Hanlon in command.