About this Unit
The Marine Detachment (Marine DET) aboard USS Chicago (CA-29), a Northampton-class heavy cruiser, was established to provide shipboard security, enforce discipline, and support naval operations during the interwar period and World War II. Throughout its service, the detachment participated in numerous training exercises and operational deployments, particularly in the Pacific theater. The Marines played a vital role during the Battle of Savo Island on August 9, 1942, manning secondary batteries and assisting with damage control as the ship engaged Japanese forces. The detachment continued to serve with distinction until the USS Chicago was sunk during the Battle of Rennell Island in January 1943.
Historical Facts
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Early Service: The Marine Detachment (DET) aboard USS Chicago (CA-29) was formed as part of standard practice for U.S. Navy cruisers, providing security, ceremonial duties, and shipboard support from the ship’s commissioning in 1931.
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Ship's Role in the Pacific: USS Chicago, with its Marine Detachment, played a significant role during the early stages of World War II, particularly in the Pacific Theater, participating in patrols and convoy escorts.
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Battle of Savo Island: The ship and its Marine Detachment were present during the Battle of Savo Island (August 9, 1942), one of the most devastating defeats in U.S. naval history, when Chicago survived but suffered damage.
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Marine Gun Crews: Marines aboard the USS Chicago manned secondary batteries and anti-aircraft guns, contributing significantly to the ship’s defensive capabilities against aerial and surface threats.
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Distinguished Service: Members of the Marine Detachment received commendations for their performance during combat, displaying bravery under fire during several engagements.
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Final Action and Sinking: During the Battle of Rennell Island (January 29–30, 1943), USS Chicago was torpedoed by Japanese aircraft. The Marine Detachment assisted with damage control efforts and in the evacuation process before the ship sank.
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Casualties and Rescue: Of the 1,049 crew, including Marines, 62 perished when Chicago sank. The remaining survivors, including most of the Marine Detachment, were rescued thanks to coordinated efforts by escorting ships.
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Legacy and Honors: The service of the Marine Detachment aboard USS Chicago is commemorated in unit citations and memorials, honoring their courage and sacrifice during the ship's final battles.
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Ceremonial Duties: In peacetime, the Marine Detachment provided honor guards for dignitaries, participated in shipboard ceremonies, and represented U.S. military tradition in foreign ports.
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Unique Camaraderie: The close quarters and shared dangers fostered a unique bond between the Marines and Navy sailors aboard the USS Chicago, with many lifelong friendships formed during their time together.
