Army Sgt. Joseph St. Germain, left, and Army Staff Sgt. Andrew Markham close a valve on an Alaska railroad water tender, or tanker, during exercise Alaska Shield 2016 in Palmer, Alaska, April 2, 2016. Germain and Markham are assigned to the Alaska National Guard’s 103rd Civil Support Team. The tender served as the source of a simulated sulfuric acid leak. Alaska Army National Guard photo by Sgt. David Bedard