Staff Sgt. Derek Lyles, 349th Air Refueling Squadron boom operator, performs a preflight inspection inside a KC-135 Stratotanker November 8, 2013, at McConnell Air Force Base, Kan. The inspection was part of Lyles check ride, a flight where he is evaluated for his upgrade training. (U.S. Air Force photo/Airman 1st Class Colby L. Hardin)
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