You can do what ChickenHawk Ted Nugent did.
ON MILITARY SERVICE
He claims that 30 days before his draft board physical, he stopped all forms of personal hygiene. The last 10 days, he ingested nothing but Vienna sausages and Pepsi; and a week before his physical, he stopped using bathrooms altogether, virtually living inside pants caked with his own excrement, stained by his urine. That spectacle won Nugent a deferment, he says. "... but if I would have gone over there, I'd have been killed, or I'd have killed, or I'd killed all the hippies in the foxholes...I would have killed everybody." - Detroit Free Press Magazine , July 15, 1990
The World According to Ted Nugent