Staff Sgt. Christopher Barnett, 319th Operations Support Squadron air traffic controller, looks through binoculars to ensure the sky is clear for incoming aircraft to make a safe approach on Grand Forks Air Force Base, N.D., April 29, 2015. Obstacles aircraft encounter while in the air include birds and other aircraft near them. Barnett also uses the binoculars to make sure the runway is clear before aircraft can land. (U.S. Air Force photo by Airman 1st Class Bonnie Grantham/Released)
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