Simple.  Bite the heads off poisonous snakes and drink their blood; walk on fire; roll around on piles of broken glass; smash bricks with your head; and use a rifle to shoot balloons out from your companions’ crotch.  Behave like a raving lunatic, in other words.  Indonesian soldiers performed these tasks “perfectly,” said an admiring General James Mattis.  American boot camps will never be the same.