In this report, RAND researchers explore the factors, contexts, and mechanisms that shape a national government’s decision to continue or end military and other operations during a conflict (i.e., national will to fight). To help U.S. leaders better understand and influence will to fight, the researchers propose an exploratory model of 15 variables that can be tailored and applied to a wide set of conflict scenarios.

The Islamic State has lost substantial amounts of territory but continues to conduct and inspire attacks around the world. This report assesses the threat the Islamic State poses to the United States and examines strategies to counter the group and prevent a resurgence of the Islamic State or other Salafi-jihadist groups.

Since 9/11, Russia, China, and Iran have successfully exploited or stretched U.S. thresholds for high-order war in order to further their strategic ends and, in the process, undermine U.S. interests. Each of these countries has made expert use of some combination of measures short of war to enact its strategies. This report describes those measures and how these nation-states use them and explains why U.S. notions of thresholds might be outdated.