The 9th Infantry Division ("Old Reliables") was created as the 9th Division during World War I, but never deployed overseas. Later, the division was an important unit of the United States Army in World War II and the Vietnam War. It was also activated as a peacetime readiness unit from 1947 to 1962 at Fort Dix, New Jersey, and Fort Carson, Colorado, and from 1972 to 1991 as an active-duty infantry division at Fort Lewis, Washington. Nicknamed the "Old Reliables", the division was eventually inactivated in December 1991.