Airmen of the 28th Medical Operation Squadron bioenvironmental engineering flight test unknown chemicals during an integrated base emergency response capabilities training exercise at Camp Lancer at Ellsworth Air Force Base, S.D., July 16, 2015. The goal of this training was to safely evaluate the situation and test chemicals to determine if biological agents were present while building cohesiveness between participating units. (U.S. Air Force photo by Senior Airman Rebecca Imwalle/Released)