Senior Airman James Chazotte, 28th Maintenance Squadron metals technology technician, repairs an aerospace ground equipment oil cart in the welding shop at Ellsworth Air Force Base, S.D., April 11, 2012. Equipment is sent to be welded if there are no other means of maintenance on the item, making the metals technology Airmen the last line of defense in keeping the B-1 equipment mission ready. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)