** FILE ** President Obama, followed by, from second from left, Gen. David Petraeus, Defense Secretary Robert Gates, Vice President Joseph R. Biden Jr., and Joint Chiefs Chairman Adm. Michael Mullen, walks to the Rose Garden of the White House in Washington, Wednesday, June 23, 2010. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

** FILE ** President Obama, followed by, from second from left, Gen. David Petraeus, Defense Secretary Robert Gates, Vice President Joseph R. Biden Jr., and Joint Chiefs Chairman Adm. Michael Mullen, walks to the Rose Garden of the White House in Washington, Wednesday, June 23, 2010. (AP Photo/Charles Dharapak)