[1] General O. H. Ernst was laid down under Maritime Commission contract 29 June 1942 by Kaiser Co., Inc., Yard 3, Richmond, California; launched 14 April 1943; sponsored by Mrs. L. M. Giannini; acquired by the Navy 31 March 1944; commissioned 22 April 1944 transferred to Portland, Oregon for conversion to a transport by Commercial Iron Works; decommissioned 13 May 1944; and recommissioned 15 July 1944.

General O. H. Ernst sailed from Seattle 27 August 1944; and, after embarking more than 3,000 fighting men at Honolulu, she transported troops to Guadalcanal, Manus, and Ulithi before returning to San Diego 4 December.

Underway again 10 days later, she carried troops to Guadalcanal and promptly returned to the West Coast, reaching Seattle 20 January 1945.

General O. H. Ernst departed San Francisco 30 May for the Panama Canal and Europe; and, after embarking veterans at Le Havre, France, she steamed to Norfolk, arriving 2 July.

As part of the post-war "Magic-Carpet" fleet, she, between 1 November and 29 July 1946, made six troop-rotation voyages out of San Pedro and Seattle to Japan, Korea, Okinawa, and Pearl Harbor.