U.S. Defense Secretary Robert Gates, second from right, pays a silent tribute with South Korean officer and officials at the National Cemetery in Seoul, South Korea, Thursday, Oct. 22, 2009. Top American defense officials maintained a tough stand Wednesday against North Korea, calling its threat more lethal than ever even as an envoy from the communist regime was headed Wednesday to the United States to discuss nuclear programs. AP Photo logo AP Photo 1 month ago

U.S. Defense Secretary Robert Gates, second from right, pays a silent tribute with South Korean officer and officials at the National Cemetery in Seoul, South Korea, Thursday, Oct. 22, 2009. Top American defense officials maintained a tough stand Wednesday against North Korea, calling its threat more lethal than ever even as an envoy from the communist regime was headed Wednesday to the United States to discuss nuclear programs.