Senior Airman Joshua Blevins, a conventional maintenance crew member from the 28th Munitions Squadron, ensures a dummy ordinance is properly fastened down on a trailer so it can be towed away by a delivery truck on Ellsworth Air Force Base, S.D. June 26, 2017. Multiple bases from Air Force Global Strike Command participated in the annual AFGSC Challenge; which highlights bomber maintenance, munitions and intercontinental ballistic missile capabilities. (U.S. Air Force photo by Airman 1st Class Thomas Karol)