Its to prep you against insurgents who use chemical warfare, like teargas or shit like that. They gas you in a room and make you put you gas mask on before you die and shit. It's kind of a tolerance thing
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actually its the real gas, no masks
I was talking with this kid about Navy SEALs training and some of the stuff he was talking about was insane. like one of the things they have to do is drown themselves, and then have people revive them (up on the D-Pad for all you noobs reading this). idk if thats really true, but it sounds HxC!!!!!!!!!!