U.S. Navy Fireman Peter Choi, Maritime Expeditionary Security Squadron 2, Boat Detachment Charlie engineer, unties a mooring line holding an 800-series Sea Ark to a dock before escorting the USS Carney through the Gulf of Tadjoura, Djibouti, 19 Sept. 2011. (U.S. Army photo by Spc. Michelle Lawrence / Released)