Marines with 2nd Maintenance Battalion, 2nd Marine Logistics Group provide security as other members of the 13 manned squad apply their mission oriented protective posture gear at a training exercise during the super squad challenge aboard Camp Lejeune, N.C., May 3, 2013. Troops were tested in a simulated chemical weapons attack by how fast they can get into MOPP 4, which is the highest level of protection from gas threats.