LST-602 was laid down on 23 October 1943 at Seneca, Illinois, by the Chicago Bridge and Iron Company. She was launched on 9 March 1944, sponsored by Mrs. Adele R. Ziehm, and commissioned on 31 March 1944.
During World War II, LST-602 was assigned to the European Theater of Operations and participated in Operation Dragoon, the invasion of southern France, in August and September 1944. In 1946 she was decommissioned/
When the Korean War broke out, LST-602 was recommissioned in 1950 and performed service in the Korean Theater from 26 November 1951 to 25 July 1952 and from 19 July 1953 to 26 February 1954. She participated in the following Korean War campaigns:
On 1 July 1955, LST-602 was renamed USS Clearwater County (LST-602). She remained in U.S. Navy service until 1957.
Clearwater County was operated by the United States Air Force from September 1957 to September 1969, when she was transferred to the temporary custody of the Maritime Administration. She was struck from the Naval Vessel Register on 1 May 1972 and given to Mexico on 30 May 1972.
In the Mexican Navy, she served as ARM Manzanillo (A-402). Manzanillo helped during operations to help Hurricane Katrina victims in 2005. On 16 November 2011 she was decommissioned.
LST-602 earned one battle star for World War II service and two battle stars for Korean War service.