U.S. Marines with the 3rd Battalion, 7th Marine Regiment and Combat Logistics Regiment 2 (Forward) attach cargo to a CH-53E Super Stallion helicopter during a helicopter support team (HST) mission at Observation Post (OP) Athens in Kajaki district, Helmand province, Afghanistan, Dec. 3, 2013. The HST mission was conducted as part of the retrograde of OP Athens.