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 12th, 1958 to September 30th, 1960.

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

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