Gen. Martin Dempsey, right, chairman of the U.S. Joint Chiefs of Staff, shakes hands with his Japanese counterpart Gen. Shigeru Iwasaki, chief of the Japanese Self Defense Forces Joint Staff, prior to their meeting at Defense Ministry in Tokyo Friday, April 26, 2013. The top U.S. military officer told American troops based in Japan on Thursday that "the best way to avoid war is to prepare for it." Dempsey made the comments at Yokota air base amid heightened tensions in the region after repeated threats from North Korea. (AP Photo/Itsuo Inouye)
Gen. Martin Dempsey, right, chairman of the U.S. Joint Chiefs of Staff, shakes hands with his Japanese counterpart Gen. Shigeru Iwasaki, chief of the Japanese Self Defense Forces Joint Staff, prior to their meeting at Defense Ministry in Tokyo Friday, April 26, 2013. The top U.S. military officer told American troops based in Japan on Thursday that "the best way to avoid war is to prepare for it." Dempsey made the comments at Yokota air base amid heightened tensions in the region after repeated threats from North Korea. (AP Photo/Itsuo Inouye)