9/4/2012 - A pair of pilots assigned to the 18th Air Refueling Squadron, 931st Air Refueling Group, inspect a KC-135 Stratotanker on the flight line prior to takeoff at McConnell Air Force Base, Kan. The KC-135 provides the core aerial refueling capability for the U.S. Air Force and has been performing in this role for more than 50 years. (U.S. Air Force photo by 1st Lt. Zach Anderson)