 They also control the movement of aircraft and vehicles on airfield taxiways and issue flight instructions to pilots by radio.Air traffic controllers provide air traffic control services in air traffic control towers, radar air traffic control facilities, fleet area control and surveillance facilities, and air operations offices ashore and afloat.They also operate radio communication systems and light signals, direct aircraft under visual flight rules and instrument flight rules conditions, and operate surveillance radar, precision radar, data link approach systems and secondary surveillance radar (IFF) equipment.