If you are active duty or a dependent thereof, you are eligible to use
Military OneSource to translate the following qualifying documents from 150 languages, including Japanese, to English for free: Leases, marriage licenses, adoption paperwork required by the U.S. Citizenship and Immigration Services, birth certificates, and school transcripts.
In the instance that you are not on active duty, not in
another eligibility category for Military OneSource or you have a non-qualifying document that you need to be translated from Japanese while in Okinawa, you can use
Okinawa Translation and Interpreter Services located in Chatan by the Seawall. Their service fees vary per document type or on a per word basis, varying on the context, with free copies available at any time.