Major communications and intelligence center for the military. Located on 73,272 acres (114 square miles) in southern Arizona, Huachuca is home to units such as the Army Intelligence Center, the Army Information Systems Command, and the Joint Interoperabilty Test Command. More than 12,000 people work at the base. Also at Huachuca are field test facilities and test ranges for communications systems and equipment, including an electronic proving ground complex, associated with White Sands Missile Range and Aberdeen Proving Ground.