Airman 1st Class Justin Locsin, 437th Aircraft Maintenance Squadron crew chief, marshals a C-17 Globemaster III to its parking spot after landing Dec. 5, 2012, at Joint Base Charleston - Air Base, S.C. Maintainers are responsible for maintaining and repairing all parts of the aircraft. (U.S. Air Force photo/Staff Sgt. Rasheen Douglas)

Staff Sgt. Norris Lewis, 437th Aircraft Maintenance Squadron crew chief, pushes a fire extinguisher into position as a C-17 Globemaster III arrives at the parking ramp, Dec. 5, 2012, at Joint Base Charleston - Air Base, S.C. After flight, maintenance crew chiefs ensure the aircraft remains operationally ready. (U.S. Air Force photo/Staff Sgt. Rasheen Douglas)

Staff Sgt. Norris Lewis, 437th Aircraft Maintenance Squadron crew chief, pushes a fire extinguisher into position as a C-17 Globemaster III arrives at the parking ramp, Dec. 5, 2012, at Joint Base Charleston - Air Base, S.C. After flight, maintenance crew chiefs ensure the aircraft remains operationally ready. (U.S. Air Force photo/Staff Sgt. Rasheen Douglas)

Staff Sgt. Norris Lewis, 437th Aircraft Maintenance Squadron crew chief, places wheel chocks under a C-17 Globemaster III Dec. 5, 2012, at Joint Base Charleston - Air Base, S.C . 437th AXMS uses wheel chocks to prevent accidental movement and used for additional safety to just setting the brakes. (U.S. Air Force photo/Staff Sgt. Rasheen Douglsa)

Airman 1st Class Justin Locsin, 437th Aircraft Maintenance Squadron crew chief, starts up an external power source for a C-17 Globemaster III Dec. 5, 2012, at Joint Base Charleston - Air Base, S.C. After flight, maintenance crew chiefs ensure the aircraft remains operationally ready. (U.S. Air Force photo/Staff Sgt. Rasheen Douglas)