Atlanta-class cruiser

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Atlanta-class cruiser

The Atlanta-class were eight United States Navy light cruisers built during 1940–1945. They were designed to be fast scout cruisers and flotilla leaders, but in World War II they proved especially effective as anti-aircraft ships. They’re sometimes called the Atlanta–Oakland class because Oakland (the lead of a slightly revised group) shared a modified armament and layout.

Design and armament
- Main guns: Eight 5-inch/38 caliber guns in four twin turrets. The arrangement gave heavy anti-aircraft fire; the early ships carried three superfiring turrets forward, three aft, and two mounts on the sides (waist).
- Anti-aircraft weapons: Initially the ship’s secondary battery included 1.1-inch/75 caliber guns, but these were quickly joined or replaced by Bofors 40 mm, Oerlikon 20 mm, and other AA weapons as they became available.
- Torpedoes: The Atlanta class carried eight 21-inch torpedo tubes in two quadruple launchers, a feature unusual for light cruisers in WWII.
- Sensors and fire control: They began with limited radar and fire-control gear but were upgraded in 1942–1943 with FD (Mk 4) radar, SC and SG radars, and Mk 37 fire-control systems (replacing earlier arrangements).
- Oakland subclass: The four later ships (the Oakland group) were outfitted with a revised layout that deleted waist 5"/38 wing turrets to improve weight distribution and added more close-range anti-aircraft weapons (including extra Bofors and 20 mm guns). This made them better air-defenders and lighter on the main battery layout.

General characteristics
- Built: 1940–1945; commissioned 1941–1943.
- Displacement: roughly 6,700–7,400 long tons.
- Dimensions: about 530 ft long, 52 ft 10 in beam, 20 ft 6 in draft.
- Propulsion: four boilers and two geared steam turbines producing about 75,000 shaft horsepower.
- Speed and range: designed for about 32.5 knots (trial speeds up to ~33.6 knots); could cruise roughly 8,500 nautical miles at 15 knots.
- Crew: about 638–766, depending on ship and wartime fit.
- Armor: light by cruiser standards; belt roughly 1.1–3.75 inches, with thinner protection on the main gun mounts and a 2.5-inch conning tower.

Service and performance
- WWII action: All eight ships served in the war. They earned a total of 54 battle stars for their activity.
- Guadalcanal and Midway: Atlanta (CL-51) helped at the Battle of Midway and the Solomon Islands campaign before being sunk at Guadalcanal in November 1942 after torpedo and gunfire damage from Japanese forces and a cruiser; Juneau (CL-52) was also sunk in the same Guadalcanal action.
- Other ships: The remaining ships—San Diego (CL-53), San Juan (CL-54), Oakland (CL-95), Reno (CL-96), Flint (CL-97), and Tucson (CL-98)—survived the war and were decommissioned in the late 1940s.
- Postwar fate: Six ships were placed in reserve after the war and redesignated CLAA in 1949. All were eventually stricken and scrapped by the 1960s–1970s.

Criticisms and legacy
- The Atlanta class were superb anti-aircraft ships, but they were less successful in surface combat. Two of the class were sunk by enemy surface ships and submarines in the Guadalcanal battles.
- Their heavy wartime upgrades made them top-heavy and crowded, and early designs lacked sufficient gunfire directors for the main battery. These issues helped spur the redesign that produced the later Juneau-class cruisers, with a different balance between main guns and air-defense.

Ships in the class
- Atlanta (CL-51)
- Juneau (CL-52)
- San Diego (CL-53)
- San Juan (CL-54)
- Oakland (CL-95)
- Reno (CL-96)
- Flint (CL-97)
- Tucson (CL-98)

Summary
The Atlanta-class cruisers were fast, heavily armed for air defense, and played a crucial role in protecting Allied fleets during World War II. While their design offered strong anti-air capabilities, their experience in combat highlighted stability and surface-action limitations, shaping later cruiser developments.