28th Civil Engineer Squadron Explosive Ordinance Disposal Airmen prepare an explosive for detonation during a National Improvised Explosive Familiarization course at Ellsworth Air Force Base, S.D., July 12, 2017. The course provided an opportunity for EOD Airmen to share their expertise while learning from outside agencies. (U.S. Air Force photo by Airman 1st Class Randahl J. Jenson)