Land and air military unit of the American military since the Revolutionary War; its undergraduate institution, the US Military Academy at West Point, New York, was opened in 1802. Despite worries about the obsolescence of ground war, the army has experienced continuing peacetime strength since the Second World War in weapons, budget and staff, and has seen action in Korea, Vietnam and the Gulf War. It also produced a postwar military president in Dwight Eisenhower. In addition to the standing army, its service pool includes the Army Reserves and the National Guards (state and federal). US army personnel in 1998 stood at 491,707, including 67,048 officers and over 65,000 women.