Fort Sill is a major United States Army post north of Lawton, Oklahoma, approximately 85 miles (137 km) southwest of Oklahoma City, established in 1869 during the Indian Wars. It covers almost 94,000 acres (38,000 ha) in southwestern Oklahoma and serves as headquarters of the U.S. Army Fires Center of Excellence. The installation is a Basic Combat Training facility, training over 20,000 personnel annually in field artillery, air defense artillery, and electronic warfare.