Samoa for surveying. After transporting Marines to Wallis Island in May, she made a survey of local harbors. During the ensuing months she conducted surveys at Noumea, New Caledonia; Nukualofa, Tonga; Port Vila and Espiritu Santo, New Hebrides; and Tulagi, Solomon Islands. Sumner weighed anchor for Sydney, Australia, 28 January 1943. In March she sailed to the Deboyne Islands to make a survey. She subsequently surveyed Stanley, Pitts, and Milne Bays in New Guinea. On 5 August she commenced a survey of Nukufetau, Ellice Islands. These operations were hampered throughout August and September by enemy air attacks. On 1 December 1943 her classification was changed to AGS-5. Between 5 December 1943 and 13 February 1944 Sumner participated in the occupation of Tarawa and conducted a survey of the newly acquired area. She sailed to Kwajalein in February 1944 where she was engaged in improving the harbor facilities until 11 April. The ship then stood out for San Francisco, via Pearl Harbor, arriving 7 May. Repairs completed, Sumner returned to the Hawaiian Islands in August. In September she steamed to Ulithi where until February 1945 she conducted survey operations. On 1 February she sailed for Guam where she remained until 27 February. On 4 March she arrived at Iwo Jima and commenced surveying operations under very adverse conditions. On 8 March she was hit by an enemy shell which killed one of her crew and injured three others. The shell failed to explode and material damage was light. Sumner continued surveying the area until 3 May when she departed for Guam. She remained at Guam until 17 June when she sailed to Leyte Gulf, Philippine Islands. Survey operations in the Philippines were completed 28 August and Sumner stood out for Jinsen, Korea, arriving 9 September 1945. She continued her survey operations in the Korea-China area until sailing for Pearl Harbor 19 December 1945. Sumner underwent a yard period at Pearl Harbor and then sailed to Bikini Atoll to conduct surveys in preparation for the coming atomic bomb tests before returning to California 24 May 1946. On 9 July she departed the west coast and proceeded to Norfolk where she reported for inactivation. She was decommissioned 13 September 1946 and transferred to the United States Maritime Commission six days later. Sumner received three battle stars for her World War II service. Awards World War I Victory Medal American Defense Service Medal with