Insurgencies in the 21st century are different than the Cold War era ones that generated existing doctrine and strategy, and which shaped the way that most American strategists think about insurgency. The beast has mutated and evolved. So, too, must those who confront it. To help Army and Department of Defense leaders master these new challenges, the Strategic Studies Institute publishes a special series entitled "Insurgency and Counterinsurgency in the 21st Century." This monograph, which assesses the growing insurgency in Nepal with its potential to further destabilize an already volatile region, is a path-breaking and an excellent inaugural effort in this new series.