Senior Airman Kristopher Garner (left), 28th Civil Engineer Squadron chemical war fare instructor, blows a small amount of stanic chloride gas around Air Force Cadet Givanni Mikel's gas mask (right) during a chemical, biological, radiological, nuclear and high-yield explosives training course. This training showed the cadets how effective gas masks are when properly sealed. (U.S. Air Force photo/Airman 1st Class Kasey Zickmund)