If you are a U.S. soldier stationed in Iraq, and want to leave, here's how: piss off the Islamic natives. Whether it's using a Koran for target practice, passing out coins with Bible verse on them, or something else, offending the Iraqi Muslim community will get you bounced from Iraq in a Baghdad minute.
It also should remind us of something. We think of the "war on terror" in terms of Islamic fundamentalism, "jihad" and what not. But I forget that a lot of people here, perhaps especially in the military, also think of it in religious terms, like a crusade. Bush even referred to waging a "crusade" right after 9/11 happened.