USS Seawolf
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Four submarines of the United States Navy have borne the name USS Seawolf, for the seawolf, a solitary fish with strong, prominent teeth and projecting tusks that give it a savage look.
- The first Seawolf, renamed H-1 (SS-28) before launching, was the lead ship of her class. Commissioned in 1913, she ran aground, and sank in 1920.
- The second Seawolf (SS-197), a Sargo-class submarine. Commissioned in 1939, she was successful during World War II until she was lost, possibly sunk by friendly fire, in 1944.
- The third Seawolf (SSN-575) was the second nuclear submarine, and the only US submarine built with a liquid metal (sodium) nuclear reactor. She was commissioned in 1957 and stricken in 1997.
- The fourth Seawolf (SSN-21) is the lead ship of her class. She was commissioned in 1997 and is on active service as of 2005.