Staff Sgt. Aaron Waaraniemi, 319th Operations Support Squadron air traffic controller, fills out flight strips while communicating with training pilots from the University of North Dakota to set an arrival sequence for them as they prepare to land on Grand Forks Air Force Base, N.D., April 29, 2015. Flight strips are a written record of everything the controller tells an aircraft to do. (U.S. Air Force photo by Airman 1st Class Bonnie Grantham/Released)
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