"I've only got about 15 minutes more before I have to get out of here, but I wanted to take some time to thank you and get the chance to shake as many of your hands as I could," he says. "The army has a system of military justice and rules and regs, so none of you needs to go off half-cocked and try and take things into your own hands." He adds: "If you quit, you're letting down not only me, but every last one of those grunts out here,. They can't quit. You can, but many of them need you".