WEBYokota Air Base (横田飛行場, Yokota Hikōjō), (IATA: OKO, ICAO: RJTY) is a Japan Air Self-Defense Force (JASDF) and United States Air Force (USAF) base in the Tama Area, or Western Tokyo. It occupies portions of Akishima , Fussa , Hamura , Mizuho , Musashimurayama , and Tachikawa .