Irregular Warfare (IW) goes by many names and definitions across the world. While some differences are only minor semantic variances reflecting the history of specific countries or the local culture of a particular state’s defense sector, other differences show widely divergent understandings based on who perpetuates and who are targeted by IW. Caught in the middle of these diverging views are U.S. warfighters, diplomats, and security cooperation professionals tasked with securing the United States from a myriad of IW threats that emanate far from America’s shores.