Airmen from the 437th Maintenance Squadron prepare to inspect a Globemaster C-17 Oct. 1, 2013, at Joint Base Charleston – Air Base, S.C. Staff Sgt. Aircraft maintenance engineers maintain and repair aircraft frames and mechanical parts. They use instruments to measure wear and test controls, replace defective components with hand tools, inspect their work to be sure it meets established standards and maintains records of actions. (U.S. Air Force photo/ Airman 1st Class Chacarra Neal)

Airmen from the 437th Maintenance Squadron prepare to inspect a Globemaster C-17 Oct. 1, 2013, at Joint Base Charleston – Air Base, S.C. Staff Sgt. Aircraft maintenance engineers maintain and repair aircraft frames and mechanical parts. They use instruments to measure wear and test controls, replace defective components with hand tools, inspect their work to be sure it meets established standards and maintains records of actions. (U.S. Air Force photo/ Airman 1st Class Chacarra Neal)

Staff Sgt. Nathon Andrews, 437th Maintenance Squadron crew chief gears up to performs an engine tylon inspection Oct. 1, 2013, at Joint Base Charleston – Air Base, S.C. Aircraft maintenance engineers maintain and repair aircraft frames and mechanical parts. They use instruments to measure wear and test controls, replace defective components with hand tools, inspect their work to be sure it meets established standards and maintains records of actions. (U.S. Air Force photo/ Airman 1st Class Chacarra Neal)

Staff Sgt. Nathon Andrews, 437th Maintenance Squadron crew chief gears up to performs an engine tylon inspection Oct. 1, 2013, at Joint Base Charleston – Air Base, S.C. Aircraft maintenance engineers maintain and repair aircraft frames and mechanical parts. They use instruments to measure wear and test controls, replace defective components with hand tools, inspect their work to be sure it meets established standards and maintains records of actions. (U.S. Air Force photo/ Airman 1st Class Chacarra Neal)

Staff Sgt. Nathon Andrews, 437th Maintenance Squadron crew chief gears up to performs an engine tylon inspection Oct. 1, 2013, at Joint Base Charleston – Air Base, S.C. Aircraft maintenance engineers maintain and repair aircraft frames and mechanical parts. They use instruments to measure wear and test controls, replace defective components with hand tools, inspect their work to be sure it meets established standards and maintains records of actions. (U.S. Air Force photo/ Airman 1st Class Chacarra Neal)