Masks on
U.S. Air Force Tech. Sgt. Thomas Breckel briefs Airmen during gas chamber training on Seymour Johnson Air Force Base, N.C., May 24, 2012. While in the chamber Airmen performed different exercises to open skin pores which allows chemicals to quickly exit the body and reduce effects of the chemical agent. Breckel, 4th Civil Engineer Squadron NCO in charge of plans and operations, hails from Wilmington, Ohio. (U.S. Air Force photo/Senior Airman Gino Reyes/Released)