Closed circuit breathing system. Used for stealth missions usually in more shallow waters. The exhaled CO2 is stored in the pouch where its neutralized. No more bubbles. The Seals have to prevent water from entering the mouthpiece. It will react with the chemicals in the pouch and cause the air to become toxic.
Nylon Pistol Belt - Quick Release Buckle
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U.S. G.I. Survival/Multipurpose Net - $19.95 :: Colemans Military Surplus LLC - Your one-stop US and European Army/Navy surplus store with products for hunting, camping, emergency preparedness, and survival gear