Camp Bullis Military Training Reservation is a U.S. Army training camp comprising 27,990 acres in Bexar County, Texas, USA, just northwest of San Antonio. Camp Bullis provides Base Operations Support and Training Support to Joint Base San Antonio. The camp is named for Brigadier General John L. Bullis, Camp Bullis and Camp Stanley make up the Leon Springs Military Reservation. Camp Bullis is used primarily as maneuvering grounds for U.S. Army, Air Force and Marines combat units.