U.S. Air Force Staff Sgt. Alexander Stromberg, 1st Operations Support Squadron air traffic controller, scans the runway for potential hazards at Langley Air Force Base, Va., Dec. 18, 2013. Air traffic controllers provide a safe, orderly and expeditious flow of aircraft on the runway as well as in the air. Stromberg hails from (U.S. Air Force photo by Airman 1st Class Victoria H. Taylor/ Released)