Army Gen. David Petraeus, U.S. Central commander, is surrounded by staff after appearing to collapse on Capitol Hill in Washington on Tuesday, June 15, 2010, while testifing before the Senate Armed Services Committee. (AP Photo/Evan Vucci)

Photo by: Evan Vucci

Army Gen. David Petraeus, U.S. Central commander, is surrounded by staff after appearing to collapse on Capitol Hill in Washington on Tuesday, June 15, 2010, while testifing before the Senate Armed Services Committee. (AP Photo/Evan Vucci)