The radio frequency spectrum is the resource that makes possible wireless communication and supports a vast array of commercial and government services. Federal, state, and local agencies use spectrum to fulfill a variety of government missions, such as national defense, airtraffic control, weather forecasting, and public safety. DOD uses spectrum to transmit and receive critical voice and data communications involving military tactical radio, air combat training, precision-guided munitions, unmanned aerial systems, and aeronautical telemetry and satellite control, among others. The military employs these systems for training, testing, and combat operations throughout the world. Commercial entities use spectrum to provide a variety of wireless services, including mobile voice and data, paging, broadcast television and radio, and satellite services.