A chemical, biological, radiological, nuclear defense specialist assists a Marine in removing his gas mask after leak, seal, package and decontamination training April 21 at the gas chamber on Camp Hansen, Okinawa. Explosive ordnance disposal technicians and chemical, biological, radiological, nuclear defense specialists placed a leaking ordnance package in the gas chamber, using chlorobenzylidene malonitrile, also known as tear gas, to simulate the emission of harmful gases. The EOD technicians and CBRN defense specialists used protective equipment to perform general decontamination of the affected area and prepare the leaking ordnance for safe containment and transport before completing the decontamination process. The training instilled the Marines’ confidence in the safety equipment and procedures used to mitigate CBRN-related hazards. The Marines are with 9th Engineer Support Battalion and Marine Logistics Group Headquarters Regiment, 3rd MLG, III Marine Expeditionary Force.