U.S. Marine Corps photo by Joel Monsalud/Released 100221-N-4745M-010.jpg
Feb 21, 2010
U.S. Marines assigned to the 31st Marine Expeditionary Unit run while wearing gas masks during physical training on the flight deck of USS Harpers Ferry (LSD 49) Feb. 21, 2010, while under way in the South China Sea. Harpers Ferry is a part of the forward-deployed Essex Amphibious Ready Group and is conducting a spring patrol to the western Pacific Ocean.
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