based on my wonderful tank knowledge from Girls Und Panzer, the foremost in all tank knowledge, those tanks seem similar to Russian T-34's... which if Yakyakistan is similar to a Eastern Bloc country, that would make sense.


See!? See they are similar. Like, very similar. SUPER Similar.
But what I impressed about in that scene we are shown, is they are drawn even slightly different in each one there, as they are moving. They are 3-dimensional drawn, each one of them, to be slightly a different perspective. That is awesome, and so happy they didn't just draw one and stamp them all over the place.