Senior Airman Richard Corpus-Munoz, 341st Security Support Squadron tactical response force nuclear advanced designated marksman flight trainer, left, spots for Airman 1st Class Keanu Valle, 341st SSPTS TRF NADM, while he fires a M24 sniper rifle Dec. 12, 2017, at Fort Harrison, Mont. TRF is responsible for preventing and denying capture of the base’s nuclear assets scattered throughout its 13,800 square-mile missile complex. (U.S. Air Force photo by Airman 1st Class Daniel Brosam)