Riggings hang at the mouth of a cavern March 29 during confined space entry training on Marine Corps Air Station Futenma, Okinawa, Japan. During the training, teams of Marines were lowered into the cavern to measure oxygen levels in the cavern, locate and neutralize threats, and perform casualty evacuation. Training in the 84-foot deep cavern allowed chemical, biological, radiological and nuclear defense Marines to train in a real world underground environment that presented geographic and tactical challenges. The Marines are with Headquarters Battalion, 3rd Marine Division, III Marine Expeditionary Force.
Cpl. Janessa Pon
Taken on 29 March 2016
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