Senior Airman Tony Pauline scans an office desk for a potential chemical agent during a training exercise 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. Pauline is a bioenvironmental engineering technician with the 779th Aerospace Medical Squadron at Joint Base Andrews, Md. (U.S. Air Force photo/Senior Airman Joshua R. M. Dewberry)

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Photo by: Senior Airman Joshua R. M. Dewberry |  VIRIN: 150317-F-BG094-134.JPG