He was already out (discharged) when he did this?
If so I see no reason to change his discharge status. JMHO
He was still in the reserves.
The military really stresses this during basic training and I was briefed again before I was discharged. You can't wear your uniform during any protests, political activities, or activities that would bring disgrace on the service - even after you're discharged.
A “release from active duty” and a discharge are two different things. When folks sign up for a 4-year enlistment, they are really in for 6 years. They are released from active duty after 4 years. The last two years are in the inactive reserves, meaning you check in with your local reserve center and then go home but the possibility of recall remains for two years. There is a briefing you have to go through that covers protesting in uniform. It’s a definite no-no.