U.S. Air Force Staff Sgt. Terence Lewis, a Metals Technology Specialist assigned to the 307th Maintenance Squadron, repairs a bolt thread on a B-52 Stratofortress engine starter Aug. 4, 2018 at Barksdale Air Force Base, Louisiana. Airmen in the metal technology shop have the education and equipment to take precision measurements and create unique tools to strengthen and correct worn metal components on the jet. (U.S. Air Force photo by Staff Sgt. Callie Ware)