President Bush is shaking up his leadership team, creating new uncertainty in Washington and on the battlegrounds of Iraq. He's nominating Navy Admiral Michael Mullen to replace Peter Pace as chairman of the Joint Chiefs of Staff, and the Senate's about to confirm Army General Douglas Lute to replace Steven Hadley in overseeing the wars in Iraq and Afghanistan. The Baghdad "surge" is getting mixed reviews, and Iraq's political leaders are still immobilized by sectarian differences. Yet, despite increased calls to bring the troops home, the Pentagon and the White House are talking about a commitment that could last for decades. We hear about top-level changes and what they could mean on the ground. Is the US arming both sides of a developing civil war?