Checking for a seal
Senior Airman Christopher Gapetz (center), a 31st Civil Engineer Squadron readiness and emergency management journeyman, prepares to use a ventilation smoke tube to test the mask confidence of Air Force members during Chemical, Biological, Radiological, Nuclear, and High Yield Explosives survival skills training March 19, here. The Readiness and Emergency Management flight holds the required CBRNE survival skills training classes approximately three times a week with 20-30 people in a class at a time. (U.S. Air Force photo/ Staff Sgt. Patrick Dixon)