He can't join the VFW or American Legion either.
Sure they can. They can be associate members or some such nonsense. Depends on where you are. The sole reason that I don't belong to the VFW is because after I was discharged in '75, a friend took me to the local VFW as a guest. The first two people I saw inside were two brothers who happened to be the sons of the lady that ran the local draft board. Both of them were healthier than me and both (surprise, surprise) were 4-F. That was enough to keep me away.