The ASEAN member Singapore was offered a similar arrangement to be a major non-NATO ally during the Bush administration, but had turned the offer down. It espouses neutrality as a principle of its foreign policy. Nevertheless, both Singapore and the United States have a close military partnership, such as the joint use of the Changi Naval Base and Paya Lebar Air Base in Singapore, as well as the Luke Air Force Base in Arizona and Mountain Home Air Force Base in Idaho. Singapore also has a permanent fighter training detachment in Guam, an organized, unincorporated territory of the United States.