USS Haddo (SS-255), a Gato-class submarine, was the first ship of the United States Navy to be named for the haddo.

USS Harder (SS-257), a Gato-class submarine, was the first ship of the United States Navy to be named for the Harder, a fish of the mullet family found off South Africa. One of the most famous submarines of World War II, she received the Presidential Unit Citation. Her commanding officer throughout her service, the resolute and resourceful Commander Samuel D. Dealey (1906–1944), "a submariner's submariner", was posthumously awarded the Medal of Honor, as well as four Navy Crosses during his lifetime.