U.S. Army Sgt. Gretchen Martinez, left, and Pvt. Joshua Spearman, both with the 92nd Chemical Company, enter a subway simulator in Level A hazardous materials suits at Muscatatuck Urban Training Complex, Ind., July 25, 2014, during exercise Vibrant Respon

- Image ID: E6AXBG
U.S. Army Sgt. Gretchen Martinez, left, and Pvt. Joshua Spearman, both with the 92nd Chemical Company, enter a subway simulator in Level A hazardous materials suits at Muscatatuck Urban Training Complex, Ind., July 25, 2014, during exercise Vibrant Respon
501 collection / Alamy Stock Photo
Image ID: E6AXBG
U.S. Army Sgt. Gretchen Martinez, left, and Pvt. Joshua Spearman, both with the 92nd Chemical Company, enter a subway simulator in Level A hazardous materials suits at Muscatatuck Urban Training Complex, Ind., July 25, 2014, during exercise Vibrant Response 14. Vibrant Response is a U.S. Northern Command-sponsored field training exercise for chemical, biological, radiological, nuclear and high-yield explosive consequence management forces designed to improve their ability to respond to catastrophic incidents.

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