Marines with 2nd Transport Support Battalion lie in the prone position during a nuclear explosion simulation during chemical, biological, radioactive and nuclear defense training held at Marine Corps Base Camp Lejeune, N.C., Dec. 1, 2015. Marines applied information obtained in classes about an active chemical threat and the proper protective equipment to decontaminate themselves in a CBRN situation. - Marines with 2nd Transport Support Battalion lie in the prone position during a nuclear explosion simulation during chemical, biological, radioactive and nuclear defense training held at Marine Corps Base Camp Lejeune, N.C., Dec. 1, 2015. Marines applied information obtained in classes about an active chemical threat and the proper protective equipment to decontaminate themselves in a CBRN situation.