The 2001 Authorization for Use of Military Force (AUMF) has become the basis for nearly every operation against international terrorism since its passage, in the days after the September 11th terrorist attacks. In particular, one 60-word passage has become foundational, both legally and philosophically, to America's "war on terror." An understanding of this document and its impact on modern foreign/military policy is essential for today's students. This article describes the origin of the Authorization for Use of Military Force, its ongoing impact, and strategies for teachers to use in class.