I don't really know what you mean by “forced”.
Let me take it two ways. One, our troops are never forced to do anything. They're given orders and they follow those orders.
Might they be in a situation where they must defend themselves? Yes. Will they use combat actions to do so? Yes, they will. Will the NATO mission morph or change into a mission where we are conducting offensive operations against Daesh? No. That is not the mandate of the mission.