U.S. Air Force Airman Brittany Harris, 18th Civil Engineer Squadron Emergency Management Flight EM operations apprentice, dons a gas mask during a hazardous materials incident exercise August 3, 2017, at Kadena Air Base, Japan. Members are trained to relax and conserve energy before entering a potentially hazardous environment to prepare for the physical demands of working in a level-A suit. (U.S. Air Force photo by Senior Airman John Linzmeier)