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  • The V-boats were a group of nine United States Navy submarines built between World War I and World War II from 1921 to 1934. These were not a ship class in the usual sense of a series of nearly identical ships built from the same design, but shared authorization under the "fleet boat" program. The term "V-boats" is used to includes five separate classes of submarines. They broke down into three large, fast fleet submarines, three large long-range submarines, and three medium-sized submarines. The successful fleet submarines of World War II were descended from the last three, especially V-7, though somewhat larger with pure diesel-electric propulsion systems. Originally called USS V-1 through V-9, in 1931 the nine submarines were renamed Barracuda, Bass, Bonita, Argonaut, Narwhal, Nautilus, Dolphin, Cachalot, and Cuttlefish, respectively. All served in World War II, six of them on war patrols in the central Pacific. Argonaut was lost to enemy action.