U.S. Marines from 3rd Marine Division, Chemical, Biological, Radiological and Nuclear defense platoon, Headquarters Battalion, III Marine Expeditionary Force, prepare to enter a room suspected of hazardous materials during exercise Habu Sentinel 16 at Disaster Village, Marine Corps Air Station Iwakuni, Japan, June 7, 2016. As the annual capstone exercise for the division’s response element, this event encompasses multiple objectives specific to CBRN response and validates unit standard operating procedures in an unfamiliar training environment. - U.S. Marines from 3rd Marine Division, Chemical, Biological, Radiological and Nuclear defense platoon, Headquarters Battalion, III Marine Expeditionary Force, prepare to enter a room suspected of hazardous materials during exercise Habu Sentinel 16 at Disaster Village, Marine Corps Air Station Iwakuni, Japan, June 7, 2016. As the annual capstone exercise for the division’s response element, this event encompasses multiple objectives specific to CBRN response and validates unit standard operating procedures in an unfamiliar training environment.