Army Staff Sgt. Michael Aldrich inspects a manhole leading to a tunnel system during chemical, biological, radiological, nuclear, and explosive training as part of Patriot Warrior at Fort McCoy, Wis., June 16, 2015. Aldrich is assigned to the 46th Chemical Company. Army Staff Sgt. Michael Aldrich inspects a manhole leading to a tunnel system during chemical, biological, radiological, nuclear, and explosive training as part of Patriot Warrior at Fort McCoy, Wis., June 16, 2015. Aldrich is assigned to the 46th Chemical Company. SHARE: Download: Full Size (1.78 MB) Tags: Photo Essays Credit: VIRIN: 368011-H-AYN81-612.jpg Photo Gallery