Staff Sgt. Tristan Alvis, 69th Maintenance Squadron, checks the tire pressure of an RQ-4 Global Hawk, July 2, 2013 on Grand Forks Air Force Base, N.D. Alvis was named the Warrior of the Week for the fourth week of June 2013. (U.S. Air Force photo/Airman 1st Class Zachiah Roberson)
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