Something to also consider; that the selective service system is there for a reason. In these times anything is possible. If things progress to the point of needing a draft (reguardless of who's president) IMO things turned very ugly and its a good possibility the draft maybe needed.
Outside of isolated instances I think the US has an outstanding military. All aspects; 100% voluntary. The only element that amazes me is an individual enlisting either full active duty or reserves and being shocked or against to being stationed in a combat situation.
www.sss.gov/