When you're new you love to scream "OORAH." It's exotic when you're a 19-year-old PFC who hasn't had the life sucked out of you ... yet. But by the time you've let the fleet devour your soul, it becomes a new word: "Rah."
It's short, elegant, and gets the point across. It's your way of saying, "I'm motivated even though I'm not really motivated."