Once again, it's a great question.
The permanent destruction of ISIS in its military form and complete eradication is unlikely to ever happen. I think there will be disaffected persons who may or may not wish to conduct crimes against their state. However, as an organized credible force that could unseat government, or indeed bring harm to the state...I think they are well on their way to achieving that.
It's more serious than just Iraq. It's Iraq and Syria. The phenomenon of ISIS has spread and is spreading, and they have franchises, if you will, spreading globally.
Attacking and dealing with the ideology is not a question of the use of military force. Military forces can help set conditions. We can collect intelligence. Where necessary, we can use force to stop activities and actions by another armed group. This is really about establishing the legal and political frameworks and about supporting countries that may fail or are failing as it relates to the protection of their borders, which creates that ungoverned space that allows for organizations like ISIL to thrive.
We are involved in that actively around the world, and not just in Iraq. We are doing capacity building around the world. We are involved in intelligence gathering. We are involved across government departments in supporting and trying to prevent governments from failing in the face of these kinds of pressures.