Air Traffic Controllers (AC) 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; operate radio communication systems and light signals; direct aircraft under Visual Flight Rules (VFR) and Instrument Flight Rules (IFR) conditions; operate surveillance radar, precision radar, data link approach systems and Identify Friend or Foe (IFF) equipment; operate ground and shipboard controlled approach systems; respond to emergency air traffic situations; maintain current flight planning information and reference material; assist pilots in preparation and processing flight plans and clearances.