Marines from the 15th Marine Expeditionary Unit board a CH-46 Sea Knight helicopter during flight quarters aboard the amphibious assault ship USS Peleliu. Peleliu is participating in Exercise Iron Fist 2012. Iron Fist is a training exercise between U.S. Marines and the Japanese Ground Self-Defense Force designed to increase interoperability and amphibious capabilities throughout U.S. 3rd and 7th Fleet areas of responsibility.