U.S. Air Force Senior Airman Randolph Callender, 36th Medical Operations Squadron optometry technician, Andersen Air Base, Guam, uses a portable autorefractor during Pacific Angel 15-4 at Unggai Primary School in Papua New Guinea, June 1, 2015. The portable autorefractor allows the optometry clinic to quickly get a baseline for a patient???s prescription glasses. The mission of Pacific Angel is to upgrade education and health facilities in the area, as well as work to deepen local disaster response capabilities. (U.S. Air Force photo by Staff Sgt. Marcus Morris/Released)
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