Master Sgt. George Greene enters information into the Computer Numeric Control milling machine at Joint Base Charleston - Air Base Dec. 15. The CNC milling machine uses the data to create a fixture to hold aircraft parts. Greene is the aircraft metals technology section chief with the 437th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Katie Gieratz)

Master Sgt. George Greene inputs information into the Computer Numeric Control milling machine at Joint Base Charleston - Air Base Dec. 15. The CNC milling machine uses the data to create a fixture to hold aircraft parts. Greene is the aircraft metals technology section chief with the 437th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Katie Gieratz)

Master Sgt. George Greene enters information into the computer automated drafting/manufacturing program which will then filter more information to the Computer Numeric Control milling machine at Joint Base Charleston - Air Base Dec. 15. The CNC milling machine uses the data to create a fixture to hold aircraft parts. Greene is the aircraft metals technology section chief with the 437th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Katie Gieratz)

Ricky Childress removes a damaged bleeder valve from aircraft ground equipment at Joint Base Charleston - Air Base Dec. 15. The aircraft metals technology shop oversees more than 70 jobs monthly and provides services for other shops around the base. Childress is a machinist with the 437th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Katie Gieratz)

Ricky Childress removes a damaged bleeder valve from aircraft ground equipment at Joint Base Charleston - Air Base Dec. 15. The aircraft metals technology shop oversees more than 70 jobs monthly and provides services for other shops around the base. Childress is a machinist with the 437th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Katie Gieratz)

Ricky Childress removes a damaged bleeder valve from aircraft ground equipment at Joint Base Charleston - Air Base Dec. 15. The aircraft metals technology shop oversees more than 70 jobs monthly and provides services for other shops around base. Childress is a machinist with the 437th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Katie Gieratz)

Master Sgt. George Greene removes burrs from a metal fixture at Joint Base Charleston - Air Base Dec. 15. The metal fixture will be used to hold aircraft parts. Greene is the aircraft metals technology section chief with the 437th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Katie Gieratz)

Master Sgt. George Greene adjusts a metal fixture at Joint Base Charleston - Air Base Dec. 15. The metals fixture will be used to hold aircraft parts. Greene is the aircraft metals technology section chief with the 437th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Katie Gieratz)