Staff Sgt. Jonathan Moroz scans a mock chemical lab for chemical agents March 17, 2015, in the Memorial Tunnel at the Center for National Response on, in Gallagher, W.Va. This training is part of the annual Black Flag exercise for first responders. Moroz is the NCO in charge of bioenvironmental training for the 779th Aerospace Medical Squadron, at Joint Base Andrews, Md. (U.S. Air Force photo/Senior Airman Joshua R. M. Dewberry)