David Darling, the 28th Maintenance Squadron Additive Manufacturing and Rapid Repair Facility site manager, inputs controls into the cold spray machine at Ellsworth Air Force Base, S.D., April 8, 2020. The controls provide instructions to the machine, detailing how to fix a piece of metal. The controls are based around the type of metal being worked on and the dimensions of all its parts. (U.S. Air Force photo by Airman Quentin K. Marx)