High Quality Content by WIKIPEDIA articles! USS Delphinus (AF-24) was built in 1915 as SS San Mateo by Workman Clark and Co., Ltd., Belfast, Northern Ireland; acquired by the U.S. Navy 11 August 1942; and commissioned the same day as San Mateo, Lieutenant O. M. Mikkelsen, USNR, in command. She was assigned the name Delphinus on 22 August 1942.