U.S. Army Reserve Soldiers assigned to the 327th Engineer Company, 397th Engineer Battalion, 372nd Engineer Brigade, 416th Theater Support Command, donned their pro masks and took vcover in their fighting positions in a complex attack that included "chemical" warfare during Combat Support Training Exercise 86-16-03 (CSTX 86-16-03) on Fort McCoy, Wis., Aug. 22, 2016. Nearly 9,000 service members from across the country are participating in CSTX 86-16-03 hosted by the 86th Training Division and the 84th Training Command’s third and final CSTX of the year. (U.S. Army Reserve Photo by Sgt. 1st Class Clinton Wood).