Since the "surge" in Iraq in 2006, counterinsurgency effectively became America's dominant approach for fighting wars. Yet many of the major controversies and debates surrounding counterinsurgency have turned not on military questions but on legal ones: Who can the military attack with drones? Is the occupation of Iraq legitimate? What tradeoffs should the military make between self-protection and civilian casualties? What is the right framework for negotiating with the Taliban? How can we build the rule of law in Afghanistan?