Airman 1st Class Katrina Garcia, 374th Civil Engineer Squadron emergency manager, briefs Airmen from the 374th Aerospace Medicine Squadron bioenvironmental engineering flight on chemical, biological, radiological and nuclear reconnaissance techniques at Yokota Air Base, Japan, Nov. 17, 2017. The group also focused on equipment and supplies, communication, integrating the base populace and remaining efficient at responding to chemical agents being released during the briefing portion of the training. (U.S. Air Force photo by Staff Sgt. David Owsianka)