A South Dakota School of Mines and Technology student demonstrates the cold spray repair process on an aircraft panel at the SDSMT in Rapid City, S.D., Jan. 31, 2013. Following a partnership with the school and other agencies, Ellsworth AFB personnel have been using this technology for more than two-years and the 28th Maintenance Group is expanding the capability by building a cold spray facility, slated to be fully operational in May 2016. (U.S. Air Force photo by Airman Ashley J. Thum/Released)