U.S. Air Force Senior Airman Caleb McKinney, 455th Expeditionary Communications Squadron radio frequency transmissions systems technician, logs into a computer before turning on a radio system Sept. 23, 2015, at Bagram Air Field, Afghanistan. McKinney is responsible for ensuring all radio systems to include air to ground radios, on Bagram remain operable at all times ensuring the mission is carried out on a daily basis. (U.S. Air Force Senior Airman Cierra Presentado/Released)