That is Buganda's symbol. It's a bit different than the one they've shown, with this one only having a half colored in shield, but it's undeniably Buganda's symbol with the shield and two spears, implying the red star is a civ's emblem or maybe an indpendant power.I didn't say that it was; I merely said that there's an argument to be made that it might be. Whereas I can't think of any Modern civs that might be in the game that would use the Panzer-IV except Germany.
If both Germany and Russia are in, that certainly wouldn't bother me.
The star being red might be happenstance of whatever leader it is. Another shot has a white star (and tan stripe).
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The Pz 4 is used by Japan, presumably from the Axis connection, using an appropriate redish-brown paint. Not great that modern era units don't seem to have the deluxe treatment that antiquity does as far as cultural variety of units.