U.S. Navy Hospital Corpsman 2nd Class Gilbert Stone, left, assigned to the 15th Marine Expeditionary Unit, teaches a Marine how to treat someone with a collapsed lung during combat life-saving training aboard the amphibious dock landing ship USS Rushmore (LSD 47) in the Pacific Ocean Sept. 27, 2012. Rushmore, along with the embarked 15th MEU, was a part of the Peleliu Amphibious Ready Group and was under way on a western Pacific deployment. (U.S Navy photo by Mass Communication Specialist 3rd Class Shawnte Bryan)