Airman 1st Class Juan Contreras, 23d Maintenance Squadron metals technology apprentice, welds a B-5 stand Dec. 16, 2019, at Moody Air Force Base, Ga. Aircraft Metals Technology specialists are responsible for repairing and creating essential aircraft parts. From troubleshooting to final fitting, machinists and welders weld, fabricate and custom-make the metal components critical to the functionality of an aircraft. (U.S Air Force photo by Airman Elijah M. Dority)