Lance Cpl. Kevin A. Kohl (left) and Cpl. Daniel T. Conroy provide security at Marine Medium Helicopter Squadron 268's forward arming and refueling point at Camp San Luis Obispo during the 11th Marine Expeditionary Unit's large-scale exercise with ocean and urban-based scenarios on July 12, 2011. Kohl and Conroy both serve as low-altitude air defense gunners with the reinforced squadron, which is the aviation combat element for the unit.