USS Seawolf (SSN-575)

USS Seawolf (SSN-575), a unique submarine, was the third ship of the United States Navy to be named for the seawolf, the second nuclear submarine, and the only US submarine built with a liquid metal cooled (sodium) nuclear reactor known as the Submarine Intermediate Reactor (SIR) or Liquid Metal Fast Reactor (LMFR), later designated S2G. Her overall design was a variant of Nautilus, but with numerous detail changes, such as a conning tower, stepped sail, and the AN/SQS-51 active sonar mounted in the top portion of the bow instead of further below. This sonar arrangement resulted in an unusual bow shape above the water for a U.S. submarine. Her distinctive reactor was later replaced with a standard pressurized water reactor, the replacement process lasting from December 12^th, 1958 to September 30^th, 1960.

Seawolf would be decommissioned on March 30^th, 1987 and stricken from the Naval Vessel Register on July 10^th. The former submarine began the Navy's Ship-Submarine Recycling Program on October 1^st, 1996 and completed it on September 30^th, 1997.

It would be succeeded in name by the Seawolf-class submarine of the same name.