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Maj. Benjamin Calhoon, 22nd Air Force executive officer, listens to presentation from Drew Cribbs, high school student from Madison, Ga., about GPS technology at Rock Eagle 4-H Center in Eatonton, Ga., Aug 17, 2019. Maj. Calhoon served as capnote speaker for the event and in previous assignments oversaw operations and policy for GPS.
18.0-140.0 mm f/3.5-5.6
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