WRIGHT-PATTERSON AIR FORCE BASE, Ohio - Senior Airman Michael Mason, 445th Civil Engineer Squadron emergency management journeyman, shows Master Sgt. James Hartsell, 87th Aerial Port Squadron air transportation craftsman, the proper technique for inspecting a gas mask during the chemical, biological, radiological, nuclear and high-yield explosive objectives (CBRNE) training class March 4. (U.S. Air Force photo/Tech. Sgt. Anthony Springer)