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Capt. Aaron Blain, 2nd Space Operations Squadron chief of navigation analyst payload, stands in front of a model of a Block IIF GPS-satellite on Schriever Air Force Base, Colo., Sept. 4, 2014. Blain maintains communications with satellites to optimize signals that serve 3.5 billion daily users. (U.S. Air Force photo/Airman 1st Class Krystal Ardrey)
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