Lance Cpl. Nicholas J. Roach, chemical, biological, radiological and nuclear defense specialist with CBRN platoon, Combat Logistics Regiment 4, 4th Marine Logistics Group, calibrates his detectors before conducting CBRN training at Camp Shelby, Miss., Nov. 17, 2015 as part of a week-long Advanced Consequence Management course. Multiple detectors are used by the CBRN defense specialists that detect everything from subtle changes in the environment to the presence of weapons of mass-destruction. (U.S. Marine Corps photo by Cpl. Ian Leones/Released)