depending on how many active members there are in the area, they meet in private homes. If Camp Zama has a web site there may be information on it ar a contact to ask questions of. Also the base Chaplin should be able to help you if you can contact him/her. Give it till after the weekend to receive an answer, some of our members are too busy to reply during the week, but are on during the weekend.
That is exactly right Frank. It is what JW call the places of meetings. In the Tokyo area there are a fairly large number of kingdom halls.
I would suggest, naenae2 san, that you contact the branch office in Ebina. If you were to get on the Net and go under Watchtower Society, branch offices, you should find the address, and contact methods. Ask them and they'll let you know where the nearest kingdom hall is and the meeting times.
Are you really a baptised Jehovah's Witness? or just an interested party?
And...welcome to the forum. I hope you do post when you can, and join in the fun with all of us here at Jref !! See you 'round !!