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Map below: Air Spaces / Water Areas Used for U.S. Forces Training in Japan ("U.S. Military Base Issues in Okinawa" issued by Henoko Base Construction Countermeasures Division, Okinawa Prefectural Government, January 2017)
Professor David Vine'sBase Nation website for his book of the same name features several resources, including comprehensive mapsof U.S. military bases around the world, including those in Japan and Okinawa. (Professor Vine is a faculty member of Department of Anthropology, American University.)