US soldiers from various branches of the military stand at attention during a mass reenlistment ceremony at the Al-Faw Palace, one of former Iraqi president Saddam Hussein's main palaces, in Baghdad on July 4, 2008. More than 1,200 US service members took a reenlisment oath on the 4th of July, the anniversary of US independence, led by top commander in Iraq General David Petraeus. (ALI AL-SAADI/AFP/Getty Images)

Photo by: ALI AL-SAADI

US soldiers from various branches of the military stand at attention during a mass reenlistment ceremony at the Al-Faw Palace, one of former Iraqi president Saddam Hussein's main palaces, in Baghdad on July 4, 2008. More than 1,200 US service members took a reenlisment oath on the 4th of July, the anniversary of US independence, led by top commander in Iraq General David Petraeus. (ALI AL-SAADI/AFP/Getty Images)