Marines with Kilo Battery, 1st Battalion, 10th Marine Regiment, 2nd Marine Division move into the woods, where they used gasmasks to train for contaminated environments during exercise Rolling Thunder aboard Fort Bragg, N.C., Oct. 19, 2014. The training helped the Marines remain ready to perform their mission in chemical, biological, radiological, and nuclear environments. (Marine Corps photo by: Cpl. Jorden M. Wells/released)