Staff Sgt. Chynna Patterson, a 28th Maintenance Group additive manufacturing spray technician, and David Darling, the 28th MXG additive manufacturing site manager, performs a cold spray restoration at Ellsworth Air Force Base, S.D., May 12, 2021. The cold spray machine uses helium gas to accelerate particles to a speed of Mach 3, and upon application, the particles form a mechanical bond with the area of impact. (U.S. Air Force photo by Airman 1st Class Quentin K. Marx)