Senior Airman David Chacon, 319th Communications Squadron High Frequency Global Communication System radio technician, helps operate one of two HFGCS sites in the United States at Grand Forks Air Force Base, North Dakota, Dec. 21, 2015. Chacon was selected for Warrior of the Week for the fourth week of December. (U.S. Air Force photo by Senior Airman Bonnie Grantham/Released)
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