I was thinking too that it looks like a Stahlhelm helmet.
Commander: "Okay people we look like a giant German helmet. Prepare to be shot at a lot!"
Crew: "We can take it sir! We are tough!"

But that's an interesting part of the game.

I wasn't particularly conscious of it, but it's certainly similar. In the process of making with the setting of wetland specifications, as a result of searching for a shape different from the mechanical weapons posted in the past, it became such a shape.

To be honest, my imagination makes it difficult to make a difference in the shape of a small tank standard.

this tank looks like a germen ww1 halmet