The United States and Japan agreed yesterday to relocate a controversial U.S. air base to a less densely populated area on the Japanese island of Okinawa. The future of Marine Corps Air Station Futenma had been a subject of intense political debate in Japan that led to the possibility of the base being moved off the island entirely, despite a 2006 agreement to relocate it on Okinawa. Talks between Secretary of State Hillary Rodham Clinton and Defense Secretary Robert M. Gates for the United States and Foreign Minister Katsuya Okada and Defense Minister Toshimi Kitazawa for Japan addressed a range...