During 1943-4, Camp Sharpe at the former Pitzer Woods CCC camp NP-1 trained soldiers for psychological operations in the European Theater of Operations, and adjacent to Camp Sharpe was a 1944-6 POW camp at CCC camp NP-2 in McMillan Woods. Following the 1950 purchase of the Eisenhower farm, the US Secret Service monitored the tourists using the top of the nearby Longstreet Tower, and the Pitzer Woods amphitheater was constructed in the 1960s The Adams County Historical Society moved to the seminary's Old Dorm on the ridge in 1961, and the National Register of Historic Places added Old Dorm in 1974 (the Gettysburg Armory in 1990).