Chief Master Sgt. Summer Leifer, 25th Air Force command chief, listens to Senior Airman Matthew Mills, 319th Operations Support Squadron air traffic control journeyman, during a tour of the base air traffic control tower June 5, 2019, on Grand Forks Air Force Base, North Dakota. Leifer’s visit to Grand Forks AFB included a tour of the 319th Communications Squadron High Frequency Global Communications System, 319th Operations Support Squadron air traffic control tower and 69th Reconnaissance Group static display of an RQ-4 Global Hawk. (U.S. Air Force photo by Senior Airman Elora J. Martinez)