Soldier of U.S. Army 173rd Airborne Brigade prior to an air analysis mission near an oil and gas separation plant at the Baba Gurgur oil field outside northern Iraq's town of Kirkuk in May 2003. Shamil Zhumatov/Reuters/Landov hide caption

itoggle caption Shamil Zhumatov/Reuters/Landov

Smoke rises after a U.S.-led coalition airstrike on Kobani, Syria, Monday, as seen from the Turkish side of the border. Kurdish fighters say they're making progress against ISIS in the area. Tolga Bozoglu/EPA/LANDOV hide caption

itoggle caption Tolga Bozoglu/EPA/LANDOV

The dirt and gravel at the Baharka displacement camp in northern Iraq will turn to a sea of freezing mud in the winter rain. Aid workers say they don't have enough blankets and winter clothing for all those displaced by the advance of ISIS. Safin Hamed/AFP/Getty Images hide caption

itoggle caption Safin Hamed/AFP/Getty Images

A black flag belonging to the so-called Islamic State is seen in the Syrian town of Kobani on Thursday, as seen from the Turkey-Syria border near the southeastern town of Suruc. Umit Bektas/Reuters/Landov hide caption

itoggle caption Umit Bektas/Reuters/Landov

Leon Panetta says he and other top national security advisers to the president argued to keep some U.S. forces on the ground in Iraq after 2011. Frederic J. Brown/AFP/Getty Images hide caption

itoggle caption Frederic J. Brown/AFP/Getty Images