USS South Dakota (BB-57)

USS South Dakota (BB-57)
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Shipname	USS South Dakota (BB-57)
Caption	USS South Dakota underway, 1943
Namesake	South Dakota
Builder	Bethlehem Steel Shipbuilding Division, Fore River Shipyard
Laid down	5 March 1940
Launched	7 June 1941
Commissioned	20 March 1942
Decommissioned	3 March 1947
Fate	Scrapped 1962
Displacement	44,500 long tons (full)
Length	680 ft (207 m)
Beam	108 ft 3 in (33.0 m)
Draft	36 ft 6 in (11.1 m)
Propulsion	Geared steam turbines, 120,000 shp
Speed	27 knots
Complement	1,880 officers and enlisted
Armor	Belt up to 12.2 in, deck up to 6 in, turret faces 18 in
Armament	9 × 16 in/45 cal, 16 × 5 in/38 cal, numerous 40 mm and 20 mm AA

USS South Dakota (BB-57) was the lead ship of the South Dakota-class battleships built for the United States Navy in the late 1930s and early 1940s. Commissioned in March 1942, she served prominently in the Pacific Ocean campaign of World War II, participating in major carrier task force actions, escort missions, and surface engagements. Renowned for her heavy protection and powerful battery, South Dakota combined with sister ships to counter the Imperial Japanese Navy fleet during decisive operations around Guadalcanal, the Gilbert and Marshall Islands campaign, and the Marianas.

Design and construction

Designed under constraints of the Washington Naval Treaty limitations and later the Second London Naval Treaty negotiations, the South Dakota-class battleship was intended to maximize protection and armament aboard a reduced displacement to meet treaty-era limits. The design emphasized internal subdivision and armored citadel derived from lessons of the Battle of Jutland and studies by the Bureau of Ships and Naval War College. Keel-laying at Fore River Shipyard followed contractual arrangements with Bethlehem Steel; South Dakota was launched with sponsorship reflecting the Governor of South Dakota and state officials. Machinery plant decisions drew on experience from the North Carolina-class battleship and incorporated improved boiler and turbine arrangements to achieve 27 knots to operate with aircraft carrier task groups such as USS Enterprise (CV-6) and USS Hornet (CV-8). Hull form and armor distribution were calibrated using analytical work by naval architects influenced by events like the Battle of the Atlantic and naval treaty technical committees.

Service history

After shakedown and training with the Atlantic Fleet elements, South Dakota transited to the Pacific Fleet and joined Task Force 16 and Task Force 18 in mid-1942. She engaged in fleet operations supporting the Guadalcanal Campaign, including night actions and the air-sea battles around the Solomon Islands. During the Naval Battle of Guadalcanal phase, South Dakota operated alongside USS Washington (BB-56), Washington, and cruisers such as USS Portland (CA-33) and USS San Francisco (CA-38), screening carrier groups and providing heavy gunfire support. Later she escorted carriers during the Gilbert and Marshall Islands campaign and the Marianas campaign, participating in raids on Truk and support for Operation Forager. Through late 1944 and 1945 South Dakota served in fast carrier task groups under Admiral William Halsey and Admiral Raymond Spruance, escorting Essex-class aircraft carriers and engaging in antiaircraft defense during kamikaze attacks in the Philippine Sea and off Okinawa. Following V-J Day she supported occupation movements before returning to the United States for decommissioning.

Armament and sensors

Primary battery consisted of nine 16-inch/45 caliber Mark 6 guns in three triple turrets, a configuration paralleling other contemporary US battleship designs such as the Iowa-class battleship conceptually but with shorter barrels and heavier armor. Secondary armament included sixteen 5-inch/38 caliber dual-purpose guns in twin mounts used extensively for antiaircraft and surface fire control tasks, a standard guided-fire armament on US Navy capital ships influenced by fire-control developments at the Naval Gun Factory. Close-in air defense was provided by multiple 40 mm Bofors and 20 mm Oerlikon mounts, which proved vital during Pacific War carrier operations against Japanese aircraft and kamikaze tactics. Fire-control and sensor fit incorporated Mark 8 and Mark 34 directors for main and secondary batteries, radar sets such as SG surface-search and SK air-search radars, and experimental radar-directed gunnery suites developed by the Naval Research Laboratory and Massachusetts Institute of Technology Radiation Laboratory.

Armor and protection

South Dakota's protection scheme featured an armored belt up to 12.2 inches thick, a main armored deck up to 6 inches, turret faces of 18 inches, and barbettes and conning tower armor to protect magazines and command positions. Internal subdivision, liquid-loading arrangements, and extensive splinter protection were influenced by analyses of battle damage in earlier conflicts and by advice from the Bureau of Ordnance. Torpedo defense arrangements included layered bulkheads and fuel/oil voids to absorb underwater explosions, reflecting improvements over earlier Colorado-class battleship arrangements. Armor layout was traded against machinery space protection and displacement constraints dictated by interwar naval policy debates involving Congress and the Navy General Board.

Modernization and postwar fate

Throughout wartime refits at Puget Sound Navy Yard and facilities like Pearl Harbor Naval Shipyard, South Dakota received progressive antiaircraft augmentations, radar upgrades, and improvements to communication and electronic suites to meet evolving Pacific Theater threats. Postwar assessments by the Secretary of the Navy and Joint Chiefs of Staff considered converting some battleships to guided-missile platforms, but South Dakota was placed in reserve amid strategic shifts toward aircraft carrier primacy embodied by United States Pacific Fleet reorganization. Decommissioned in 1947 and stricken from the Naval Vessel Register in the 1960s, she was sold for scrapping in 1962, ending a service life that intersected with figures such as Admiral Chester W. Nimitz and technological institutions like the MIT Radiation Laboratory.

Category:South Dakota-class battleships Category:World War II battleships of the United States