Air Traffic Control
Senior Airman John Porter, air traffic control operator, uses a microphone to communicate with pilots on Barksdale Air Force Base, La., Aug. 8, 2014. The microphone sends a voice recording to a computer program that pilots can dial into to receive additional information on flight conditions, such as weather, potential hazards, and a flock of birds. (U.S. Air Force photo/Airman 1st Class Benjamin Raughton)