Cor Caroli was launched 19 March 1943 as SS Betsy Ross, MCE hull 476, by Permanente Metals Corporation, Yard No. 2, Richmond, California, under a Maritime Commission (MARCOM) contract; sponsored by Mrs. B.F. Hodglin; acquired by the Navy 31 March 1943; commissioned 16 April 1943 and reported to the Pacific Fleet.[4]
She proceeded to Bougainville, where she joined in the invasion from 8 to 17 February, splashing a Japanese plane when air resistance developed. She returned to Bougainville with additional cargo from 6 to 11 March, and next operated off Emirau from 9 to 16 April in landings there. Cor Caroli continued to operate in the Solomons until 12 June, when she sailed for Eniwetok. After standing by in reserve during the invasion of Eniwetok, she sailed on with her cargo to Guam, where she participated in the assault from 27 July to 15 August.[4]
Supporting Philippine invasion operations
Cor Caroli returned to the Southwest Pacific early in September 1944, and carried cargo among the bases there until 13 January 1945, when she arrived at Auckland to load new cargo, which she carried to Eniwetok and Guam. Returning to New Zealand for brief repairs, she sailed on to Pearl Harbor, arriving 8 June to load cargo for the Philippines. She ferried among Philippine ports between 13 July and 4 August, when she sailed for Guadalcanal, Espiritu Santo, Pearl Harbor, and San Pedro, California.[4]