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Sailors assigned to the forward-deployed amphibious transport dock ship USS New Orleans (LPD 18) approach an MV-22B Osprey helicopter to chock and chain it after it landed on flight deck while in the Philippine Sea during Keen Sword 23. Keen Sword is a joint, bilateral, biennial field-training exercise involving U.S. military and Japan Self-Defense Force personnel, designed to increase combat readiness and interoperability and strengthen the ironclad Japan-U.S. alliance.