That school evolved into the U.S. Army Command and General Staff College. The Western Branch National Military Home ("old soldiers' home"), now called the Veterans Medical Center, or Dwight D. Eisenhower Medical Center Historic District was established in 1885 as part of the National Home for Disabled Volunteer Soldiers system. The soldier home is closely associated with the nearby cemetery that became the Fort Leavenworth National Cemetery in 1973. World War I was the first opportunity to evaluate the impact of Sherman's school. Graduates excelled in planning complex American Expeditionary Forces operations. By the end of the war, they dominated staffs throughout the AEF. In the years between the world wars, graduates included such officers as Dwight D. Eisenhower, Omar Bradley and George S. Patton. During World War II, some 19,000 officers completed various courses at Fort Leavenworth. By the end of 1943, commanders and staffs of 26 infantry, airborne and cavalry divisions had trained as teams at the school. General Michael Joe Costello of the army of the newly formed Irish Free State attended Fort Leavenworth from 1926 to 1927, passing with such distinction that he was recommended for the United States Army War College. In 1946, the school was given its current name. In 1959, the college moved to the newly built J. Franklin Bell Hall on Arsenal Hill. In 1985, the Harold Keith Johnson wing was added to house the Combined Arms and Services Staff School (CAS3). Classes for the School of Advanced Military Studies and the School for Command Preparation, as well as the Combined Arms Research Library, are located in Eisenhower Hall which was dedicated in 1994. It was declared a National Historic Landmark in 1960. Until the early 1970s, a battery of four Nike-Hercules Missiles were deployed at Bell Point on a hill on the west side of the fort. The base is served by the Sherman Army Airfield which has a runway and operates under a joint agreement with the city of Leavenworth, Kansas that permits civilian aircraft to use it all hours. The airfield was inundated by the Missouri River in levee breaches during the Great Flood of 1951, the Great Flood of 1993, and the Great Flood of 2011. Fort Leavenworth is considered one of the most significant historic military installations in the Department of the Army, as well as to the nation. The fort's 5,634 ac (2,279 ha) contain a 213 ac (86.1 ha) National Historic Landmark District (NHLD), which was established in 1974.