USS Seawolf (SSN-21), the lead ship of her class, is the fourth submarine of the United States Navy named for the seawolf, a solitary fish with strong, prominent teeth and projecting tusks that give it a savage look. The contract to build her was awarded to the Electric Boat Division of General Dynamics and Newport News Shipbuilding on 9 January 1989 and her keel was laid down on 25 October 1989. She was launched on 24 June 1995, sponsored by Mrs. Margaret Dalton, and commissioned on 19 July 1997 with Commander David M. McCall in command.