You could always chew, if you don't mind people thinking the inside of your mouth tastes and looks like feces.
How often does the military test your piss? Because there is a vitamin B supplement called Niacin that will flush the THC out of your urine in five days. All you do is take five pills of it every night for five nights, your urine gets red (it isn't blood and it doens't hurt) and you'll be clean.
I wouldn't risk it though, if I were you, because the sample might be diluted, and a lot of people consider a diluted sample to be a positive test.