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 under authorization as the "fleet boat" program.
The term "V-boats" as used includes five separate classes of submarines: large, fast fleet submarines (V-1 through V-3), large long-range submarines (the minelayer V-4 and two submarine cruisers V-5 and V-6) and three medium-sized submarines (V-7 through V-9).
The successful fleet submarines of World War II ( through ) 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 (SS-163 through SS-171), in 1931 the nine submarines were renamed , , , , , , , , and , respectively. All served in World War II, six of them on war patrols in the central Pacific. Argonaut was lost to enemy action.
In the early 1910s, only 12 years after inaugurated the Navy's undersea force, naval strategists had already begun to wish for submarines that could operate in closer collaboration with the surface fleet than the Navy's existing classes, which had been designed primarily for coastal defense. These notional "fleet" submarines would necessarily be larger and better armed, but primarily, they would need a surface speed of some to be able to maneuver with the 21-knot battleships around which the battle fleet was built. This was the designed speed of the and later battleships, including the standard-type battleships that were under construction and proposed in 1913.
In the summer of 1913, Electric Boat's chief naval architect, former naval constructor Lawrence Y. Spear, proposed two preliminary fleet-boat designs for consideration in the Navy's 1914 program. In the ensuing authorization of eight submarines, Congress specified that one should "be of a seagoing type to have a surface speed of not less than twenty knots". This first fleet boat, laid down in June 1916, was named USS Schley after Spanish–American War hero Winfield Scott Schley.