It was Fukuoka, or Futenma, or something like that. As recently as 6 months or a year ago, that building showed up on LDS tools meetinghouse locator, but it no longer does. I assume they sold it when the chapel was built? It was south of Kadena, probably took us 20-25 minutes to drive there.
As High Schoolers, my brothers and friends and I spent a lot of time in the East China Sea. Best youth conference ever was a 2-3 hour ferry ride out to a smaller island where we spent a lot of time on the beach and a few hours listening to gospel instruction. That was a fun 5 day trip.