GRISSOM AIR RESERVE BASE, Ind., -- Senior Airman Karl Ackerman, 434th Aircraft Maintenance Squadron, "pulls" a fuel sample from a Grissom KC-135R Stratotanker as part of an early morning pre-flight check. Such checks are critical to ensure water has not settled in the fuel tanks. (U.S. Air Force photo/Staff Sgt. Chris Bolen)
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