I'm not sure why we're withdrawing from Iceland. It sits in a strategic spot in the North Atlantic.
There's no realistic threat of an invasion of Iceland, so their security isn't really in question. But, there's no realistic threat of an invasion of Japan, and we've had troops there for over 60 years.
I think we should ask the poster of the thread this question. Leifur lives there. IMO, there is no good reason why we'd abandon Iceland, other than money issues. Maybe we don't have all the details? Anyway, IMHO, Iceland is like Canada, if either were attacked, we'd be there in a heartbeat.
"It sits in a strategic spot in the North Atlantic", and it behooves us to protect them.