Senior Airman James Chazotte, 28th Maintenance Squadron metals technology technician, welds during upgrade training certification in the welding shop at Ellsworth Air Force Base, S.D., April 11, 2012. Metals technology specialists are trained and certified on several methods of repair, in order to efficiently repair unserviceable items. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)