An FBI Special Agent Bomb Technician instructs 28th Civil Engineer Squadron Explosive Ordinance Disposal Airmen while preparing explosives during a National Improvised Explosive Familiarization course at Ellsworth Air Force Base, S.D., July 12, 2017. The joint training exercise provides an opportunity for several agencies to work together, strengthening their interoperability and readiness in case of a real-world emergency. (U.S. Air Force photo by Airman 1st Class Randahl J. Jenson)