High Quality Content by WIKIPEDIA articles! SS Mission San Juan was a Type T2-SE-A2 tanker built for the United States Maritime Commission during World War II. After the war she was acquired by the United States Navy as USS Mission San Juan (AO-126). Later the tanker transferred to the Military Sea Transportation Service as USNS Mission San Juan (T-AO-126). She was a member of the Mission Buenaventura-class oiler and was named for Mission San Juan Bautista in San Juan Bautista, California.