361st Training Squadron aircraft metals technology apprentice course students use four jaw chucks to create and refine aircraft parts out of aluminum at Sheppard Air Force Base, Texas, July 18, 2018. Althought the aircraft parts will only be used in training, they are taught in 68 training days how to precisely cut, resize, and smooth these metals. Advanced training continues once they reach their permanent duty station. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)