Wow this is nice! I especially like the green one with the American flag - it really pops. Have you thought about adding something like an M1 Ambrams? I think it'd fit great in the set.
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Oh ok, sorry for my misunderstanding. Now that I looked at it, I can totally see it as an M1 ambrams. It's just the color thats a little hard to read, maybe consider making it more beige? But it's very nice to know that you'll be making even more of these! I'll definitely consider these if I ever decide to learn some decent c++ (getting there) and make a game.