150807-N-IP531-388 PACIFIC OCEAN (Aug. 7, 2015) The Nimitz-class aircraft carriers USS George Washington (CVN 73), left, and USS Ronald Reagan (CVN 76) are underway before conducting a hull-swap. Ronald Regan will replace George Washington in Japan. The force structure change allows George Washington to undergo its mid-life refueling complex overhaul and Ronald Reagan to support the security and stability of the Indo-Asia-Pacific region. (U.S. Navy photo by Mass Communication Specialist 3rd Class Chris Cavagnaro/Released)