united states naval hospital yokosuka japan with its eight branch clinics are us navy medical treatment facilities catering to the medical needs of eligible sailors, marines, soldiers, airmen, family members, u.s. government employees, retired military service members and other eligible beneficiaries of the forward deployed naval forces on mainland japan, korea and diego garcia. the core hospital is located on board commander fleet activities yokosuka with branch clinics serving naval air facility atsugi, combined arms training center camp fuji, commander fleet activities chinhae korea, naval support activity diego garcia, marine corps air station iwakuni and commander fleet activities sasebo.