We got an inside look at how US Navy recruits are exposed to tear gas during basic training. Insider spent five days at Navy Recruit Training Command, Great Lakes, where we observed recruits at various stages of their 10-week boot camp. During the fourth week of training, recruits learn how to properly don an M50 gas mask and are exposed to CS gas in the "confidence chamber." While wearing a gas mask, the recruits watch as an instructor burns a CS capsule over a hot plate, filling the chamber wi