Airman Marlene Zeledon (right) samples a chemical agent during a training exercise with Staff Sgt. Yaoska Quintana March 17, 2015, in the Memorial Tunnel at the Center for National Response in Gallagher, W.Va. This training is part of the annual Black Flag exercise for first responders. Zeledon is an emergency management specialist with the 11th Civil Engineer Squadron and Quintana is the NCO in charge of flight readiness for the 779th Aerospace Medical Squadron, and both are assigned to Joint Base Andrews, Md. (U.S. Air Force photo/Senior Airman Joshua R. M. Dewberry)
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