The Japanese women that I knew, or knew of, were really hot little sex machines and got totally involved in sex. They LOVED sucking cock and getting dick, and their enthusiasm was both obvious and catching. I was sorry to leave the place.
Did you have any difficulty getting your wife into the US when you rotated? I had a buddy who had a really difficult time getting approval to many a foreign national. He had to call his congressman before they would approve and allow her to enter the country. I talked with him about 5 years ago and he told me that they are still happily married and now have *******. Hope you and your wife are happy and doing well. Is she still as hungry for cock and cum as she was then?
You sound like a very lucky man.
As an aside, WE are not the only societies where wife sharing occurs on a regular basis. We are happy to be a part of that.