Chemical, biological, radiological and nuclear defense specialists walk with sandbags in a wheelbarrow to simulate removing a casualty from a hazardous area during a reconnaissance fitness test May 24 at Camp Hansen. The CBRN Marines performed the fitness test to prepare for their upcoming deployment with the 31st Marine Expeditionary Unit, III Marine Expeditionary Force. - Chemical, biological, radiological and nuclear defense specialists walk with sandbags in a wheelbarrow to simulate removing a casualty from a hazardous area during a reconnaissance fitness test May 24 at Camp Hansen. The CBRN Marines performed the fitness test to prepare for their upcoming deployment with the 31st Marine Expeditionary Unit, III Marine Expeditionary Force.