REUTERS

Iraq could be asked to take any Iraqi citizens captured, but if there are Syrians or foreign fighters captured by the U.S. it's not clear what will happen to them. In May, U.S. Delta Force commandos captured a woman named Umm Sayyaf, wife of senior ISIS operative Abu Sayyaf. U.S. troops turned her over to the Iraqis, the report says.

This time, however, no decisions have been made on where people will be held – or who will interrogate them – especially if Syrian or European ISIS leaders are captured.

This is just one of the many issues to be decided after Defense Secretary Ash Carter testified on initials details of the force.

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"These special operators will, over time, be able to conduct raids, free hostages, gather intelligence and capture ISIL leaders," he told Congress. "This force will also be in a position to conduct unilateral operations in Syria."

So many details remain to be worked out however, officials say, it could be weeks before the troops arrive. They are expected to be based in Irbil, Iraq. Officials initially have said the total force, including helicopter support, could total 200. But the U.S. military spokesman in Baghdad, Col. Steve Warren, suggested it could total around 100.