This book examines how the United States should improve its counterinsurgency (COIN) capabilities through, for example, much greater focus on understanding jihadist strategy, using civil measures to strengthen the local government, and enabling local forces to conduct COIN operations.It provides a broad discussion of the investments, organizational changes, and multilateral arrangements that the United States should pursue to improve its COIN capabilities.It examines the challenge of 21st-century insurgency, exemplified by the global jihadist movement, and describes the civil, information, perception-and-cognition, and security capabilities required for effective counterinsurgency.