Maj. Gen. Richard Clark, Eighth Air Force commander, listens to a presentation about the cold spray system at Ellsworth Air Force Base, S.D., Jan. 19, 2016. Ellsworth is one of the first bases to implement the cold spray system, which has the potential to save the Air Force millions of dollars when repairing damages. (U.S. Air Force photo by Airman 1st Class James L. Miller/Released)