From left to right, U.S. Air Force Airman 1st Class Jerry Tondini, 633rd Security Forces Squadron installation entry controller, assists Staff Sgt. Daniel Zorko, 633rd Security Forces Squadron response force leader, with removing his gas mask during a combined unit exercise at Langley Air Force Base, Va., Dec. 12, 2012. The chemical decontamination process experience instructed Airmen how to successfully remove their mission orientated protective posture gear after a simulated chemical attack. (U.S. Air Force photo by Senior Airman Racheal E. Watson/Released)