Cinchona (YN-7) was launched on 2 July 1941 by Commercial Iron Works, Portland, Oregon; sponsored by Mrs. W. Casey; outfitted by Puget Sound Navy Yard; and placed in service on 15 August 1941.

Continuing her salvage operations in the Hawaii group, Cinchona salvaged district patrol craft YP-108 off Lanai in June 1942, and in August escorted a motor torpedo boat convoy to Midway Islands, where she installed nets around the dock spaces, returning to Pearl Harbor early in September.

She conducted patrols, assisted LST-84 after an enemy bomb started a fire on board, and then inspected the Japanese net line in Tanapag Harbor.

From 7 December 1944 to 30 June 1945 Cinchona conducted net operations, laid moorings, and aided in installing a pipeline at Guam.

Returning to the States 27 July, she conducted net operations at Long Beach, California, and out of Mare Island Naval Shipyard until 24 August 1946 when she sailed for Astoria, Oregon.