@Fido,
I really don't want to get into a re-hash of whether we should have went into Afghanistan in the first place other than to say, I think we had no choice but I think we handled it badly.
I really don't know a lot of about having strategic ground so I am going to leave the discussion of whether we should remove ourselves from most of our bases around the world to others who know what they are talking about.
I do think we should remove ourselves from the two war fronts, Iraq (which we shouldn't have gone into in the first place) and Afghanistan. We pretty well have to leave Iraq because of the security agreement which was signed during the previous administration. I think the signs are there more than ever that we going to drastically reduce the military presence in Afghanistan, I think we have worn out our welcome if we ever had any with both the leaders of Afghanistan and Pakistan. From what I have reading, the ties between Pakistan and the US are weakening and the ties between China and Pakistan are getting stronger.
In any event, IMO, the money spent on those wars could be money spent here at home.