Why do German helmets have no insignia? They kinda look blank without their flank signs.
Far bigger fish to fry a the moment.
This.
Looking at pictures I see 80% without the insignia.
So actually, no thanks.
They removed them for a reason.
I would go the other way, and add camo like mud or paint to the helmets.
I wouldn't mind seeing the decals in some early-war maps, but by the point of Stalingrad, most soldiers likely had the decals removed. As said earlier, they do make a bit more of an obvious target.