 The Division also has two Wullenweber intercept and direction finding, as well as offices in Kobunato (in Niigata Prefecture), Oi (in Saitama Prefecture), Tachiarai (in Fukushima Prefecture), and Kikaijima (in Kagoshima Prefecture).Beginning in the 1990s, and according to William Arkin with a declaration of Jordan as a combat zone for U.S. personnel on September 19, 2001, there has been increasing intelligence cooperation between the US and Jordan.Arkin states there are permanent US SIGINT ground stations now in Jordan.