As seen through a night-vision device, Marines prepare to hook onto a sling line attached to a Marine Corps CH-53E Super Stallion helicopter during external lift training at Marine Corps Air Station Miramar, Calif., Oct. 14, 2015. The Marines are assigned to Combat Logistics Battalion 13 and the helicopter crew is assigned to Marine Medium Tiltrotor Squadron 166 Reinforced, 3rd Marine Aircraft Wing. U.S. Marine Corps photo by Sgt. Brian Marion