Commander of the U.S. Central Command, Gen. David Petraeus, is surrounded by staff after appearing to pass out on Capitol Hill in Washington, Tuesday, June 15, 2010, while testifing before the Senate Armed Services Committee. Gen. Petraeus, who was dehydrated, left the room but returned after 20 minutes. (AP Photo/Evan Vucci)

Photo by: Evan Vucci

Commander of the U.S. Central Command, Gen. David Petraeus, is surrounded by staff after appearing to pass out on Capitol Hill in Washington, Tuesday, June 15, 2010, while testifing before the Senate Armed Services Committee. Gen. Petraeus, who was dehydrated, left the room but returned after 20 minutes. (AP Photo/Evan Vucci)