USS Plunger (SSN-595), a Permit-class submarine, was the third ship of the United States Navy to be named "plunger", meaning a diver or a daring gambler. The contract to build her as a guided-missile submarine (SSGN) was awarded to Mare Island Naval Shipyard on 23 March 1959, but by the time her keel was laid down on 2 March 1960 she had been redesigned as an attack submarine (SSN). She was launched on 9 December 1961 (sponsored by Mrs. Clinton P. Anderson), and commissioned on 21 November 1962.