To stop the bloviating, here is the source:
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Army Veterans. Instructions are listed in paragraph 30-4 of Army Regulation 670-1.
Former members of the Army may wear the uniform if they served honorably during a declared or undeclared war, and if their most recent service was terminated under honorable conditions (that means an honorable or general discharge).
Personnel who qualify under these conditions will wear the Army uniform in the highest grade they held during such war service.
The uniform is authorized for wear only for the following ceremonial occasions, and when traveling to and from the ceremony or function. Uniforms for these occasions are restricted to service and dress uniforms; the BDU and physical fitness uniforms will not be worn.
(1) When attending military funerals, memorial services, weddings, inaugurals, and other occasions of ceremony.
(2) When attending parades on national or state holidays, or other patriotic parades or ceremonies in which any active or reserve United States military unit is taking part.
Former Soldiers who are discharged honorably or under honorable conditions from the Army (even if it’s not during wartime service) may wear their uniform while going from the place of discharge to their home of record, within three months after discharge.
Wear of the Army uniform at any other time, or for any other purpose than stated above, is prohibited.
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Note that the BDU/ACU is not authorized, only the SERVICE-aka Class A (formerly green, now Blue) and the dress uniforms, for veterans or retiree’s except if they are performing as ROTC instructors etc (again, per the previous paragraph of 670-1).
So, from the regs, the guy is wrong on a lot of counts, even if he is a bona fide veteran-
When I was in I had a hard enough time keeping up with the changes with AR 670-1 and local uniform standards then putting them out to my guys.
Was deployed 6 months and the day I got back I asked the Bn CSM if anything had changed while we were gone. “Nothing. By the way you guys have to go to the range and qualify in the morning”. Next morning our team is walking to the trucks and the CSM sticks his head out the window chewing me out because we were in the wrong uniform. It had changed while we were gone.
So in a case like the OP, if I have to I’ll quietly ask a few questions. And anybody from the US Military who had served in Europe would know blacks have been serving with whites since the 1940’s.