"A Military Guide to Terrorism in the Twenty-First Century is a reference guide prepared under the direction of the U.S. Army Training and Doctrine Command, Assistant Deputy Chief of Staff for Intelligence-Threats. Understanding terrorism spans foreign and domestic threats of nation-states, rogue states with international or transnational agent demonstrations, and actors with specific strategies, tactics, and targets. A central aspect of this terrorism guide comprises foreign and domestic threats against the United States of America in a contemporary operational environment (COE). Purpose. This informational handbook supports operational missions, institutional training, and professional military education for U.S. military forces in the Global War on Terrorism (GWOT). This capstone document provides an introduction to the nature of terrorism and recognition of terrorist threats to U.S. military forces. A common situational awareness by U.S. military forces considers three principal venues: forces that are deployed, forces that are in transit to or from an operational mission, and forces that are primarily installation or institution support. Compiled from open source materials, this handbook promotes a 'Threats' perspective and enemy situational awareness of U.S. strategies and operations in combating terrorism. Neither a counter-terrorism directive nor anti-terrorism manual, the handbook complements but does not replace training and intelligence products on terrorism."
U.S. Army Training and Doctrine Command: http://www-tradoc.army.mil/index.html