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| - The United States' S-class submarines, often simply called S-boats (sometimes "Sugar" boats, after the then contemporary Navy phonetic alphabet for "S"), were the first class of submarines with a significant number built to United States Navy designs. Others of this class were built to contractor designs. S-2 was a prototype built by Lake, and was not repeated. The first S-boat, S-1, was launched on 26 September 1918, by Bethlehem at Fore River, but not commissioned until 5 June
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| abstract
| - The United States' S-class submarines, often simply called S-boats (sometimes "Sugar" boats, after the then contemporary Navy phonetic alphabet for "S"), were the first class of submarines with a significant number built to United States Navy designs. Others of this class were built to contractor designs. The United States Navy commissioned 51 S-Class submarines from 1920 to 1925. The first S-boat, USS S-1 (SS-105), was commissioned in 1920 and the last numerically, USS S-51 (SS-162), in 1922. The last of the class actually commissioned was USS S-47 (SS-158) in 1925. The S class is subdivided into four groups of different designs:
* Group I (S-1 class, or "Holland" type): 25 boats, S-1 and S-18 to S-41, built by Bethlehem Steel at Fore River Shipyard in Quincy, Massachusetts and Union Iron Works in San Francisco, California, as subcontractors for the designer, the Electric Boat Company.
* Group II (S-3 class, or "Navy Yard" type): 15 boats, S-3 to S-17, built at the Portsmouth Navy Yard and Lake Torpedo Boat at Bridgeport, Connecticut.
* Group III (S-42 class, or "2nd Holland" type): 6 boats, S-42 to S-47, built at Fore River.
* Group IV (S-48 class, or "2nd Navy Yard" type): 4 boats, S-48 to S-51, built by Lake. S-2 was a prototype built by Lake, and was not repeated. S-1, S-2, and S-3 were prototypes built to the same specification: S-1 designed by Electric Boat, S-2 by Lake, and S-3 by the Bureau of Construction and Repair (BuC&R) (later Bureau of Ships).[2] The Lake boat was considered inferior. The Electric Boat and BuC&R designs were put into production as Group I and Group II. SS-159 to SS-168 (2nd Holland) and SS-173 to SS-176 (2nd Navy Yard) were cancelled and, contrary to later practice, the hull numbers were used for subsequent submarines.[3] Some of the material for these was used by Electric Boat to build thePeruvian Navy's four R-boats. The first S-boat, S-1, was launched on 26 September 1918, by Bethlehem at Fore River, but not commissioned until 5 June
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