"In the case of Asian systems, they are designed against a missile threat from North Korea. They are not directed at China." Nuland said the U.S. has broad discussions with China through military and political channels about the systems' intent. In addition to one American X-band radar – officially known as the AN/TPY-2 – hosted by Japan the United States and Japan announced an agreement on 17 September 2012, to deploy a second, advanced missile-defense radar on Japanese territory. "The purpose of this is to enhance our ability to defend Japan," U.S. Secretary of Defense Leon Panetta said at a news conference. "It’s also designed to help forward-deployed U.S. forces, and it also will be effective in protecting the U.S. homeland from the North Korean ballistic missile threat." In addition to detecting ballistic missiles the radars also provide the U.S. military and its allies a highly detailed view of ship traffic in the region. That capability is particularly desired by U.S. allies in the region that are engaged in territorial disputes with China over contested islands and fishing grounds. Some U.S. officials have noted that defenses built up against North Korean missiles would also be positioned to track a Chinese ballistic missile. A land-based radar would also free the Navy to reposition its ship-based radar to other regional hot-spots, officials said. A U.S. team landed in Japan in September 2012 to discuss where the second facility will be located, according to a U.S. defense official. Officials have said they want to locate the radar, formally known as AN/TPY2, in the southern part of Japan, but not on Okinawa, where the U.S. military presence is deeply controversial. During a joint news conference in Tokyo, Panetta and Japanese Defense Minister Satoshi Morimoto said a joint U.S.-Japanese team would begin searching immediately for a site for the new radar. On 15 November 2012, Australia and the United States announced that the US military will station a powerful radar and a space telescope in Australia as part of its strategic shift towards Asia. "It will give us visibility into things that are leaving the atmosphere, entering the atmosphere, really all throughout Asia", including China's rocket and missile tests, a US defence official told reporters on condition of anonymity. On 14 October 2002, a ground based interceptor launched from the Ronald Reagan Ballistic Missile Defense Test Site destroyed a mock warhead 225 km above the Pacific.