C-17 Refueling, Selfridge
150825-Z-EZ686-031 -- A KC-135 Stratotanker from the 127th Air Refueling Group, Selfridge Air National Guard Base, Mich., refuels a C-17 Globemaster III from the 445th Airlift Wing during a training mission on Aug. 25, 2015. The KC-135 Stratotanker is operated by the 127th Air Refueling Group, flown by the 171st Air Refueling Squadron and maintained by the 191st Maintenance and 191st Aircraft Maintenance squadrons. (U.S. Air National Guard photo by Master Sgt David Kujawa / Released)