U.S. special operations forces headed to Iraq to fight ISIS

On Tuesday, Defense Secretary Ash Carter announced a specialized expeditionary targeting force will be deployed to Iraq to fight the Islamic State.

Carter told the House Armed Services Committee the U.S. will launch raids "at the invitation of the Iraqi government" and "conduct unilateral operations in Syria" against ISIS targets, with the goal of defeating ISIS "at its core." He did not say when the troops will arrive.

Department of Defense officials told NBC News about 100 to 150 special operations forces will be permanently based in Iraq, and will gather intelligence, free hostages or prisoners, and kill or capture ISIS leaders. They will also accompany and assist Iraqi and Kurdish forces in operations against ISIS. A senior defense official told NBC News the missions will be similar to the raid that was conducted in northern Iraq in October, where commandos helped Kurdish fighters free 70 ISIS prisoners.