and skills at parades and other community events. Historic recognition Fort Sill was declared a National Historic Landmark in 1960. Fort Sill itself, and multiple locations within Fort Sill, are on the National Register of Historic Places listings in Comanche County, Oklahoma. Fort Sill is currently the home to three museums; The Fort Sill National Historic Landmark and Museum, comprising the original frontier fort and the thirty-four historic structures, making it the most complete original Indian Wars era frontier fort in existence. The U.S. Army Field Artillery Museum was opened in 2009 and houses a diverse collection of artillery pieces and related artifacts on exhibit to tell the story of the history of the Field Artillery Branch. The U.S. Army Air Defense Artillery Museum is housed in temporary facilities, having moved from Fort Bliss, TX in 2010. The ADA Museum houses a vast collection of Anti-aircraft and Air Defense Artillery artifacts and exhibits to tell the history and heritage of the Air Defense Branch. All museums are free of charge to the public and open Tuesday to Saturday, 9 am to 5 pm. Cemeteries There are various cemeteries on Fort Sill, with their own histories and significance. The most famous is the Post Cemetery, at the intersection of Macomb and Geronimo Roads. Many Indian chiefs who signed the Medicine Lodge Treaty came to rest at Fort Sill Post Cemetery. Unlike most cemeteries of its day, it was never segregated. Troopers of the 10th Cavalry Regiment, known as the "Buffalo Soldiers" who died at Fort Sill lie next to these chiefs. Officers, soldiers, spouses and children lie side-by-side regardless of their race or social status. The most famous person buried at Fort Sill is the Apache warrior known as Geronimo. Geronimo is buried in the Apache Cemetery on East Range. Because his grave is off the beaten path, the route is marked with signs. Others buried at Fort Sill include Kiowa Chief Satanta, and Comanche Chief Quanah Parker. 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.