USS Suisun, a 1,766-ton Barnegat class small seaplane tender built at Houghton, Washington, was commissioned in September 1944. After shakedown training at San Diego, she sailed for Eniwetok in December 1944. Between January and April 1945 she tended various PB2Y and PBM seaplane squadrons in the Caroline and Marianas Islands. She moved to Kerama Retto, Ryukyu Islands, with the Okinawa invasion force in April and remained there until the end of the war except for one trip to Saipan for supplies. She was the eighth ship to enter Tokyo Bay in August 1945 and remained there until leaving for the United States in November 1945.

Assigned to the postwar Atlantic Fleet, Suisun arrived at Norfolk in January 1946 and, after overhaul, conducted operations along the east coast and in the Caribbean. In October 1946 her home port was shifted to Coco Solo, Canal Zone. She returned to the Pacific in April 1947 and began a series of deployments throughout the Pacific basin, including the China, Japan, the Central Pacific islands, Alaska, Mexico, and the Western Pacific. During several of these deployments she supported seaplanes from Whidbey Island, Washington. Between July and October 1950, during the early months of the Korean War, the tender and her seaplanes operated in the vicinity of the Pescadores Islands and monitored mainland Chinese military activity. USS Suisun was decommissioned in August 1955 and sunk as a target in October 1966.