Between April and October 1918 Calamares made five voyages to France as her part of the Navy's vast responsibility to transport to the American Expeditionary Force reinforcements, munitions, and supplies. On 11 October 1918 she was transferred to the Naval Overseas Transportation Service at New York, and converted to a refrigerator ship.

Calamares carried perishable provisions on three voyages to France from 8 November 1918 to 12 March 1919, and then was reassigned to the Cruiser and Transport Force for service as a troop carrier. On five transatlantic voyages between 25 March and 17 August Calamares brought home more than 10,000 troops from St. Nazaire and Brest.

Calamares was decommissioned 18 September 1919, and returned to her civilian peacetime operations.

World War II required the services of every available ship, and Calamares was once more called. On 12 December 1941 the veteran ship was reacquired by the navy, classified AF-18, and converted to a provisions storeship. She was recommissioned on 10 April 1943 and reported to the U.S. Pacific Fleet.

Destined for a dual role as food carrier and issuing ship, Calamares cleared San Francisco, California, 23 April 1943 for Noumea, New Caledonia, where from 13 May to 11 June she issued provisions to the fleet units operating from this headquarters of the South Pacific. In June, she sailed to Auckland, New Zealand, for fresh stores, and from Noumea Calamares made a cruise of the South Pacific bases, supplying navy and army forces ashore. Returning to San Francisco in August, the storeship operated between the west coast and Pearl Harbor until 22 November, when she sailed for the South Pacific again, carrying Christmas delicacies as well as the usual stores for ships based on Funafuti, Ellice Islands, and Nouméa.

On 1 January 1944 Calamares reported to Commander, Service Force U.S. 7th Fleet, at Sydney, Australia, and until June 1945, provided vital logistic support for operations in New Guinea and the Philippines, carrying provisions from Australia, and on two occasions from San Francisco, to the operation areas.

After hostilities ended Calamares continued to support Far East operations into 1946. Returning to Norfolk, Virginia, 1 April 1946, Calamares was decommissioned at Baltimore, Maryland, 25 April 1946, and returned to the War Shipping Administration.

Calamares' crew members were authorized the following medals:

• World War I Victory Medal
• American Campaign Medal
• Asiatic-Pacific Campaign Medal
• World War II Victory Medal
• Navy Occupation Service Medal (with Asia clasp)

This article incorporates text from the public domain Dictionary of American Naval Fighting Ships. The entry can be found here.

• NavSource Online: Service Ship Photo Archive - ID-3662 / AF-18 Calamares