Senior Airman Andrew Robinson, an 315th Aircraft Maintenance Squadron member, installs a spark plug into a C-17 Globemaster III engine yesterday on the flightline here at Joint Base Charleston, S.C. Robinson provided maintenance support along with other 315th MXG members yesterday while the 437th Maintenance Group took part in the active duty’s wingman day activities. (U.S. Air Force photo by Staff Sgt. Rashard Coaxum)