Did anyone say what he use to do in the military. Did they say he was in a fighting unit. It is important. The government didn't want to have Blacks in the military. They didn't encourage it until they found it advantageous; because of lack of manpower. The Blacks who were already in were generally in servitude roles. The same roles that they did that their White American or Eropean counterpart did. Were seen as good roles and a very worthwhile contribution to the war effort and very necessary; but there white counterpart could also serve in combat outfits if they wanted to.
There was only two combat units that had Blacks in them and were regular combat outfits; but had mostly white officers in the major deciding roles. They had Black officers; but all black troops were look at as inferior nd that was from Wilson and Pershing and the White officers in charge.
You can look at his uniform. The panths are a little different from the jacket. The panths look like some form of riding panths that the Calvary had; but he has no spurs.
If he was in a servitude role and on the front and people were dying all around him. He might have anything on; because supplies sometime didn't make it to the front. You grab what you could when things got old or worn out.
It is important to know if anyone can say what he did. I found one card that comes close; but I am still looking.