President Barack Obama, followed by Gen. David Petraeus, right, and Defense Secretary Robert Gates, left, arrives in the Rose Garden of the White House in Washington, Wednesday, June 23, 2010, to announce that Petraeus would replace Gen. Stanley McChrystal.  (AP Photo/J. Scott Applewhite)

Photo by: J. Scott Applewhite

President Barack Obama, followed by Gen. David Petraeus, right, and Defense Secretary Robert Gates, left, arrives in the Rose Garden of the White House in Washington, Wednesday, June 23, 2010, to announce that Petraeus would replace Gen. Stanley McChrystal. (AP Photo/J. Scott Applewhite)