Staff Sgt. Theodore Van De Sample, 47th Civil Engineer Squadron readiness and emergency flight NCO in charge, right, helps 2nd Lt. Charles Heim, 47th Civil Engineer Squadron officer in charge of emergency management, drink from his canteen during a chemical, biological, radiological and nuclear training course at Laughlin Air Force Base, Texas, Sept. 12, 2013. Each person attending the course needed to show proficiency in drinking from a canteen while wearing a gas mask. (U.S. Air Force photo/Senior Airman John D. Partlow)