This is my custom 88mm flak cannon. I believe it is a German design and I have American soldiers running it. And there black helmets are because when I was making divisions with my ww2 guys i needed to know who was who so for my small artillery division I make them black helmets for the most part. For the explanation for why American soldiers are using a German gun is because when they toke the bunker they didn't destroy the gun and there was a lot of ammunition for it so they were like " let's use your weapons against them" kinda thing. Let me know what you think. And sorry for the mess behind it