The most controversial cemetery on post lies under Henry Post Army Airfield. The old Indian Agency Cemetery, which includes both Comanche and white remains, is located just south of the last hangar at the airfield. In the 1950s, in order to reduce the hazard of airplanes or helicopters landing or parking in the area, Army engineers took down all the grave stones and covered the entire area with a four-inch cover of earth. The earliest known still-existing listing of those buried at this cemetery is known as the "1917 Harper's List." For many years, the cemetery sat forgotten by history. In 1984 Towanna Spivey, an archeologist and curator of the Fort Sill National Landmark and Museum, completed a scientific investigation of records and the site. He identified 64 persons buried in that cemetery by name, but another 50 graves were listed as unknown. Out of respect, none of the remains have ever been dug up or disturbed.