It may at first seem counterintuitive that an increased threat from North Korea has resulted in a reduction of U.S. troops in the region. North Korean nuclear antics, although not solely responsible, have helped Japan embrace constitutional changes that will allow it to take a more active role in regional security. One result, and again this is an issue with more than one side, is that 7,000 U.S. Marines will be leaving Okinawa, Japan. UPDATE, 30 October: The U.S.-Japan agreement...