GULF OF THAILAND (Feb. 13, 2011)USMC CH-46E Sea Knight helicopters operate aboard the forward-deployed amphibious assault ship USS Essex (LHD 2). The Essex Amphibious Ready Group is participating in exercise Cobra Gold 2011, a U.S. and Thailand co-sponsored multinational exercise designed to improve interoperability between participating nations. (U.S. Navy photo by Mass Communication Specialist 2nd Class Eva-Marie Ramsaran/Released