What is the first thing pollies do when they get elected? They ditch any inconvenient promises by any means necessary. I don't expect either US presidential candidate to be any different.
Retrenching is a very easy promise to keep, it will make a lot of people in the US happy. With all those military folk coming home a lot of bases will either need to be reopened or expanded, of course some numbers will be cut but the money flowing into communities and not being spent overseas will be a boon for many communities.