Airman 1st Class Matt Sinclair, 437th Aircraft Maintenance Squadron crew chief, inspects a Globemaster III C-17 wing, June 24, 2014, at Joint Base Charleston, S.C. The maintainers perform daily checks and maintenance to ensure the aircraft are ready to fly. (U.S. Air Force photo/Senior Airman George Goslin)

Joint Base Charleston Globemaster III C-17s line the ramp, June 24, 2014, at JB Charleston, S.C. 437th Airlift Wing maintainers perform daily checks and maintenance to ensure the aircraft are ready to fly. (U.S. Air Force photo/Senior Airman George Goslin)

437th Airlift Wing Globemaster III C-17s line the ramp, June 24, 2014, at Joint Base Charleston, S.C. The maintainers perform daily checks and maintenance to ensure the aircraft are ready to fly. (U.S. Air Force photo/Senior Airman George Goslin)

Airman 1st Class Dalton Rock, 437th Aircraft Maintenance Squadron crew chief, refills liquid oxygen on a Globemaster III C-17, June 24, 2014, at Joint Base Charleston, S.C. The maintainers perform daily checks and maintenance to ensure the aircraft are ready to fly. (U.S. Air Force photo/Senior Airman George Goslin)

Airman 1st Class Matt Sinclair, 437th Aircraft Maintenance Squadron crew chief, inspects a Globemaster III C-17 wing, June 24, 2014, at Joint Base Charleston, S.C. The maintainers perform daily checks and maintenance to ensure the aircraft are ready to fly. (U.S. Air Force photo/Senior Airman George Goslin)

Airman 1st Class Matt Sinclair, 437th Aircraft Maintenance Squadron crew chief, inspects a Globemaster III C-17 wing, June 24, 2014, at Joint Base Charleston, S.C. The maintainers perform daily checks and maintenance to ensure the aircraft are ready to fly. (U.S. Air Force photo/Senior Airman George Goslin)