The US is also fighting - or was, depending on severe this collapse is going to continue to grow if we keep getting new people - that may have deployed or stranded individual units overseas in the chaos that follows. They might be attempted to be recalled, they may never hear the word, or they get the recall notice but knowing what's happening at home or believing in the cause as it relates to their allies abandon their posts and stay put on the front fighting for a new country with the same cause in international brigades all their own.

On top of that, pause to consider that most of the men and women overseas may be considered citizen soldiers in the sense citizen is weighed over soldier and may defect the federal government to join with whatever local faction has taken power in interests of simply defending their friends and family and all notions of being supported by the Federal Government as they had before being washed down the drain.