U.S. Army Sgt. Joshua Roberts, assigned to U.S. Army

U.S. Army Sgt. Joshua Roberts, assigned to U.S. Army Training and Doctrine Command, prepares to enter the chemical, biological, radiological, and nuclear chamber during the 2014 U.S. Army Best Warrior Competition at Fort Lee, Va., Oct. 7, 2014. The Best Warrior Competition events are designed to measure not only physical or athletic abilities, but also the warrior's leadership, teamwork and critical thinking. (U.S. Army photo by Staff Sgt. Patricia Ramirez/Released)