Master Sgt. Tim Thornton, 437th Maintenance Squadron aircraft metals shop noncommissioned officer in charge, walks towards arc welding protection drapes with a sledge hammer in his hands Aug. 7, 2013, at Joint Base Charleston, S.C. The red drapes protect individuals not wearing a welding shield from taking in the intense light emitted during welding produces. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Airman 1st Class William Williams, 437th Maintenance Squadron aircraft metals technology journeyman, drills holes into a sheet of metal during training Aug. 7, 2013, at Joint Base Charleston, S.C. The sheet metal is used to simulate steel work on a C-17 Globemaster III wing. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Airman 1st Class William Williams, 437th Maintenance Squadron aircraft metals technology journeyman, uses a saw to cut a hole out of a piece of sheet metal during training Aug. 7, 2013, at Joint Base Charleston, S.C. The sheet metal is used to simulate steel work on a C-17 Globemaster III wing. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Airman 1st Class William Williams, 437th Maintenance Squadron aircraft metals technology journeyman, uses a sander on the edges of a piece of sheet metal during training Aug. 7, 2013, at Joint Base Charleston, S.C. The sheet metal is used to simulate steel work on a C-17 Globemaster III wing. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Airman 1st Class William Williams, 437th Maintenance Squadron aircraft metals technology journeyman, grinds a piece of steel tube Aug. 7, 2013, at Joint Base Charleston, S.C. The sheet metal is used to simulate steel work on a C-17 Globemaster III wing. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Airman 1st Class William Williams, 437th Maintenance Squadron aircraft metals technology journeyman, prepares to lay out a cut with a ruler and black marker on a sheet of metal Aug. 7, 2013, at Joint Base Charleston, S.C. The sheet metal is used to simulate steel work on a C-17 Globemaster III wing. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Airman 1st Class William Williams, 437th Maintenance Squadron aircraft metals technology journeyman, prepares to lay out a cut with a ruler and black marker on a sheet of metal Aug. 7, 2013, at Joint Base Charleston, S.C. The sheet metal is used to simulate steel work on a C-17 Globemaster III wing. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Airman 1st Class William Williams, 437th Maintenance Squadron aircraft metals technology journeyman, lays out a cut with a ruler and black marker on a sheet of metal Aug. 7, 2013, at Joint Base Charleston, S.C. The sheet metal is used to simulate steel work on a C-17 Globemaster III wing. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Sheet metal scraps are scattered around a lathe machine after a piece of aluminum is milled down to size Aug. 7, 2013, at Joint Base Charleston, S.C. Airmen from the aircraft metals fabrication shop are trained to use several different pieces of equipment to bend, cut and combine metals. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Sheet metal scraps are scattered around a lathe machine after a piece of aluminum is milled down to size Aug. 7, 2013, at Joint Base Charleston, S.C. Airmen from the aircraft metals fabrication shop are trained to use several different pieces of equipment to bend, cut and combine metals. (U.S. Air Force photo/Senior Airman Dennis Sloan)

Airman 1st Class Tashma Antoine, 437th Maintenance Squadron aircraft metals apprentice, measures a piece of aluminum before cutting it on a lathe Aug. 7, 2013, at Joint Base Charleston, S.C. Airmen from the aircraft metals fabrication shop are trained to use several different pieces of equipment to bend, cut and combine metals. (U.S. Air Force photo/Senior Airman Dennis Sloan)

A sheet metal sign with a C-17 Globemaster III, the Arthur Ravenel Jr. Bridge and a Palmetto tree with a crescent, hangs in the 437th Maintenance Squadron aircraft metals shop Aug. 7, 2013, at Joint Base Charleston, S.C. Airmen from the aircraft metals fabrication shop are trained to use several different pieces of equipment to bend, cut and combine metals. (U.S. Air Force photo/Senior Airman Dennis Sloan)