SS Cynthia Olson was a cargo ship originally built in Wisconsin in 1918 as the SS Coquina. Renamed in 1940, in August 1941 she was chartered by the US Army to transport supplies to Hawaii. While in passage between Tacoma, Washington and Honolulu on December 7, she was intercepted by the Japanese submarine I-26, which sank her with gunfire. Although the commander of the submarine ensured that all of the crew had escaped into boats, none of them was ever found. Cynthia Olson was the first United States Merchant Marine vessel to be sunk after the entry of the United States into World War II.