U.S. Sailors run to chock and chain down an Army UH-60 Black Hawk helicopter on the flight deck of the amphibious dock landing ship USS Harpers Ferry (LSD 49) during deck landing qualifications in the Persian Gulf Dec. 26, 2013. The Harpers Ferry and the 13th Marine Expeditionary Unit were deployed in support of maritime security operations and theater security cooperation efforts in the U.S. 5th Fleet area of responsibility.