Army Staff Sgt. Henry Cancinos conducts chemical, biological, radiological and nuclear defense training at Joint Base Elmendorf-Richardson, Alaska, April 13, 2016. The training culminated with masked soldiers entering a sealed chamber filled with tear gas and then removing their protective gear to promote confidence in their equipment. Cancinos is assigned to the 25th Infantry Division’s Bravo Troop, 1st Squadron (Airborne), 40th Cavalry Regiment. Air Force photo by Justin Connaher