The Atlantic Council’s Brent Scowcroft Center on International Security recently held a high-level war game to explore future courses of action that the US-led coalition could pursue against ISIS in Iraq and Syria, including staying the course, implementing a diplomatic surge, and carrying out a heavy military intervention. Participants explored these options with the aim of informing key domestic and regional stakeholders on the critical components of a successful coalition strategy. The public event presents the findings of the simulation, before initiating a broader discussion of the strategic challenges facing the United States and its partners in the fight against ISIS.