Marines with 2nd Battalion, 7th Marine Regiment, based out of Marine Corps Air Ground Combat Center Twentynine Palms, Calif., apprehend a role-player in a riot control mission scenario during a non-combatant evacuation exercise at Kiwanis Park in Yuma, Ariz., Friday, Oct. 16, 2015. The Marines were tasked and evaluated on their ability to maintain control of role-players simulating hostile behavior. - Marines with 2nd Battalion, 7th Marine Regiment, based out of Marine Corps Air Ground Combat Center Twentynine Palms, Calif., apprehend a role-player in a riot control mission scenario during a non-combatant evacuation exercise at Kiwanis Park in Yuma, Ariz., Friday, Oct. 16, 2015. The Marines were tasked and evaluated on their ability to maintain control of role-players simulating hostile behavior.