. >> with a hyper dermic needle 15 drops was enough to kill thousands. >> reporter: the army's perfectct. 43,000 military personnel u.n. inspectors, white house officials, local police and firefighters have safely completed this training. >>> not all the chemical and bilogical training uses these deadly chemicals. so does the army. >> no go. no go. go. >> then it's time for the gas chamber. inside percolating is a mixture of tear gas and alcohol. this stuff will get your attention and make you blind with mis misery in the process. the recruit enters the chamber with gas masks on. inside they must remove the masks and engage in a short conversation with the drill master which of course keeps his mask on the entire time. here is what happens next. >> hold your arms up. hold your arms up. close your eyes, close your eyes. keep them closed. keep going, keep going. hold your arms up. >> let many go. >> how bad is it? >>here's a sampling taking a few moments later. >> great, great i liked it. >> i didn't like it at all. >> how was it. >> you can't breathe. if they tell you to stop you can't