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[–] Blacksmith21 [S] 0 points 1 point (+1|-0) ago 

Change the tank color (easy) and it looks like a Drager Rebreather System to me. But what do I know?

https://www.draeger.com/en_me/Law-Enforcement/Products/Diving-Equipment-and-Systems/Diving-Equipment/PSS-Dive-EN