File photo of US Marines showing weapons to visiting Japanese Self-Defense Force cadets at Camp...

U.S. Marines demonstrate their weapons to visiting Japanese Self-Defense Force cadets at Camp Schwab on Japan's southern island of Okinawa in this June 19, 2003 file photo. Japan and the United States are narrowing differences over where to relocate a U.S. military base in Japan, a key sticking point in talks on the realignment of U.S. forces in Japan, part of Washington's plan to transform its military globally into a more flexible force. Japan had insisted on incorporating the Marines' Futenma's airport into the Marines' Camp Schwab. Picture taken June 19, 2003. REUTERS/Eriko Sugita/File