Wow... very interesting story Raul. Japan probably has one of the most US military bases in the far east Asia. The island of Okinawa alone contains hundreds of US military bases and Tokyo I believe has 3 major ones. I used to play basketball in high school and our league consisted of US base schools and International American schools.
Well I must admit... japanese girls can be very attractive
Do you have any plans on reuniting with your brother? If he's half American/half Japanese I am sure you can narrow your search down significantly. Ill be more than happy to help in any way possible.