She saw service in the Pacific Theater of Operations during the latter stages of World War II and the immediate postwar period.

Comet cleared San Diego, California, on 26 April 1944 carrying U.S. Marines to Pearl Harbor, Territory of Hawaii.

From New Guinea, she brought another group of reinforcements in February 1945, then departed Lingayen Gulf to carry hospital patients from Pearl Harbor to San Francisco, California.

Until 1 August 1946, Comet ranged the Pacific Ocean in the postwar redeployment of military men and the return to the United States of homeward-bound veterans.

On 1 September 1946, the War Shipping Administration's functions were transferred to the United States Maritime Commission, which sold Comet to American Pioneer Lines in 1948.