private schools in New York. 1918—1950 On 1 September 1918, with World War I underway, the U.S. Army took back Carlisle Barracks from the Department of Interior. It used the facility to respond to a wide set of changing army and security needs. At the end of World War I, the U.S. Army established General Hospital No. 31 as a pioneering rehabilitation center there. For two years, the hospital provided medical treatment, mental reconditioning and vocational training for more than 4,000 afflicted soldiers returned from service with the American Expeditionary Forces in France. Carlisle Barracks' equipment laboratory designed and tested new products, including improved lighting for field hospitals, a field dental dispensary, first aid kits for arctic rescue, and the "First-aid Packet, U.S. Government Carlisle Model" bandage field dressing In the fall of 1920, the Medical Field Service School was established under Colonel Percy M. Ashburn's command. Drawing on the lessons of World War I, the school developed medical equipment and doctrine suitable for the battlefield. More than 30,000 officers and NCOs passed through the school during its 26-year tenure at Carlisle Barracks. They applied classroom instruction and field exercises to train in care of casualties and disease prevention, the latter a major problem for the military until improvements in sanitation and antibiotics. When the Medical Field Service School departed in 1946 for Fort Sam Houston at San Antonio, Texas after World War II, educational innovation continued. From 1946 until 1951, six U.S. Army schools were located at Carlisle Barracks. First was the Army Information School, followed shortly by the School for Government of Occupied Areas, and the Adjutant General's School for army personnel managers. The next year brought the Chaplain School and the Military Police School. Finally, the Army Security Agency School began highly classified operations in 1949 and stayed for two years before being displaced. United States Army War College In the spring of 1951, the United States Army War College, senior educational institution of the U.S. Army, relocated to Carlisle Barracks in central Pennsylvania. The college, established in 1903 and formerly located in Washington, D.C., had functioned as part of the General Staff during its early years. It chiefly prepared selected officers for high command. Distinguished graduates of that period included John J. Pershing (Class of 1905), Dwight D. Eisenhower (1927), and Omar N. Bradley (1934). Classes were suspended in 1940 during the preparedness mobilization for World