USS Haddock
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Three ships of the United States Navy have been named USS Haddock for the haddock, a small edible Atlantic fish related to the cod.
- The first Haddock (SS-32) was K-1, which saw overseas duty during World War I.
- The second Haddock (SS-231), a Gato-class submarine, served during World War II.
- The third Haddock (SSN-621), a Thresher-class submarine, served during the Cold War.