U.S. Air Force Senior Airman Stephen Shannon, right, with the 8th Civil Engineer Squadron, uses a sponge and bleach solution to decontaminate the mask of Staff Sgt. Hezekiah Barrett, with the 8th Medical Operations Squadron, at Kunsan Air Base in South Korea March 19, 2013, during exercise Beverly Midnight 13-2. Beverly Midnight is an operational readiness exercise sponsored by the 8th Fighter Wing that is designed to evaluate and measure the ability of installations to execute their combat mission in a chemical environment by creating realistic scenarios for exercise evaluations. (U.S. Air Force photo by Senior Airman Marcus Morris/Released)