Pacific Tankers, Inc. of San Francisco, California was founded in 1943 as a division of Joshua Hendy Corporation to operate Fleet Oilers for the United States Navy to support World War II efforts. Pacific Tankers, Inc. operated Mission Buenaventura-class oiler, a Type T2 tanker. Each Pacific Tankers, Inc. tanker has a merchant crew of about 9 officers and 39 men. Pacific Tankers Inc. was a major tanker operator for the war with a fleet of over 60 tankers. Pacific Tankers, Inc. continued operations after the war.

SS Mission Santa Ynez 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 Santa Ynez (AO-134). Later the tanker transferred to the Military Sea Transportation Service as USNS Mission Santa Ynez (T-AO-134). A Mission Buenaventura-class oiler, she was named for Mission Santa Inés located in Solvang, California.