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.

A Marine Infantry Officer Course (IOC) student descends from a CH-53E Super Stallion helicopter during a fast rope drill on the Marine Corps Air Station Yuma, Ariz., Auxiliary Landing Field 2, Wednesday, August 18, 2014. The fast rope training instilled in these Marines the skills necessary to complete IOC’s final exercise, Talon Reach IV. - A Marine Infantry Officer Course (IOC) student descends from a CH-53E Super Stallion helicopter during a fast rope drill on the Marine Corps Air Station Yuma, Ariz., Auxiliary Landing Field 2, Wednesday, August 18, 2014. The fast rope training instilled in these Marines the skills necessary to complete IOC’s final exercise, Talon Reach IV.