President Obama (center) and Vice President Joseph R. Biden Jr. (left) greet Gen. Lloyd Austin, the top U.S. commander in Iraq, on the apron at Joint Base Andrews outside Washington on Tuesday, Dec. 20, 2011. (AP Photo/Carolyn Kaster)

Photo by: Carolyn Kaster

President Obama (center) and Vice President Joseph R. Biden Jr. (left) greet Gen. Lloyd Austin, the top U.S. commander in Iraq, on the apron at Joint Base Andrews outside Washington on Tuesday, Dec. 20, 2011. (AP Photo/Carolyn Kaster)