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KC-135 pilot, Captain Duane Boyle with Copilot, Lt. Colonel Larry Christensen in the cockpit of a U.S. Air Force KC-135E take off from the Sioux City, Iowa airport on January 4, 2007. The pilots are departing the Air National Guard base in Sioux City for an air refueling mission off the coast of North Carolina before returning home the same day. U.S. Air National Guard photo Master Sgt. Vincent De Groot
18.0-200.0 mm f/3.5-5.6
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