Casablanca is the Moroccan port that was the American base for the North African campaign. The escort carrier that took the name had already been called Ameer, and then Alazon Bay. She became Casablanca on 3 April 1943 and CVE-55 on 15 July. Kaiser at Vancouver launched her on 5 April 1943. Mrs. F. D. Roosevelt sponsored her. The Navy acquired her on 8 July 1943, and Commander W. W. Gallaway commissioned her the same day. She reported to the Pacific Fleet.
From her commissioning through August 1944 she stayed in the Strait of Juan de Fuca and trained crews for other escort carriers. On 24 August she cleared San Francisco with men, airplanes, and aviation gasoline for Manus. She was back at Seattle on 8 October and trained again in Puget Sound until 22 January 1945, then repaired at San Diego.
She sailed on 13 March, called at Pearl Harbor, and delivered passengers and aircraft at Guam. Through the spring she moved passengers, aircraft, and aviation gasoline among Samar, Manus, and Palau, and on 12 May she started back for a west-coast overhaul. On 24 June she was at Pearl Harbor with passengers. Through the summer she carried sailors from the west coast to Pearl Harbor and Guam, qualified carriers off Saipan in August, and reached San Francisco on 24 September with servicemen bound home.
She kept at that work: a voyage to Pearl Harbor in September and October, a November passage to Pearl Harbor, Espiritu Santo, and Noumea, and a last run from San Francisco to Yokohama between 8 December 1945 and 16 January 1946. She cleared San Francisco on 23 January, reached Norfolk on 10 February, and was decommissioned there on 10 June 1946. She was sold on 23 April 1947.