I’d like to think that Arstotzka has a national hockey team, one made up of army personnel (much like Russia’s Red Army squad), playing against rivals from Obristan and Kolechia. These are all fictional countries from the game Papers, Please.
The jersey is Arstotzka’s flag, with design cues from several Russian national jerseys. The M.O.S. seal stands for Ministry of Sport. I broke my “no hockey sticks” rule here, the seal imagery really screamed hockey stick to me.