SPRING SPRINT U.S. Marines exercise on the flight deck of the amphibious dock landing ship the USS Harpers Ferry in the South China Sea, Feb. 21, 2010. The Marines are assigned to the 31st Marine Expeditionary Unit. The Harpers Ferry, part of the Essex Amphibious Ready Group, is conducting spring patrol to the western Pacific Ocean. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 260757-Z-QFW48-940.jpg Photo Gallery