From left, outgoing Commanding Gen. Ray Odierno, Secretary of Defense Robert Gates, Vice President Joe Biden, Chairman of the Joint Chiefs Admiral Mike Mullin, CENTCOM commander Gen. Mattis, and incoming Commanding Gen. Lloyd Austin, are briefed on the change of command ceremony in the Al Faw Palace at Camp Victory in Baghdad, Iraq, Sept. 2, 2010. (Official White House Photo by David Lienemann)