U.S. Army Staff Sgt. Robert Robertson, 82nd Civil Support Team survey team chief, and U.S. Army Sgt. Alex Page, 82nd CST survey team member, collect samples of a simulated unknown substance during a training exercise at Ellsworth Air Force Base, S.D., Jan. 23, 2014. The 82nd CST team consists of 22 individuals trained to assist authorities in response to chemical, biological, radiological, nuclear and explosive threats. (U.S. Air Force photo by Senior Airman Zachary Hada/Released)