Tech. Sgt. Shawn Summers, a 315th Maintenance Group member and C-17 Globemaster III crew chief here at Joint Base Charleston, S.C., checks off items on his maintenance checklist yesterday as he finishes repairs on a C-17 Globemaster III on the flightline here at Joint Base Charleston, S.C. The 315th MXG provided operational flight line coverage 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)