Book excerpt: This paper examines the current Building Partner Capacity and Security Force Assistance capabilities and capacities within the United States Army as well as Department of Defense. The current operational environment calls for us to look at history, policy, doctrine and other academic proposals to identify capability and capacity gaps. As the General Purpose Force looks forward to expanding roles in Irregular Warfare, Foreign Internal Defense and Security Assistance, does the U.S. Army have the proper force structure and minimal capability to fight and win the counterinsurgency of the future? This paper analyzes this construct and provides a framework for identifying proponency, institutionalizing lessons learned from OIF and OEF as well as providing military, police and governance structure as a tool for global engagement. This new structural paradigm will help the United States gain access, influence and build capacity throughout this new world order.