Terrorism is increasingly in the news. The United States, as the preeminent world power, will become increasingly a target of terrorist acts. This paper analyzes the role of the U.S. Civilian Authorities and Military Forces in the battle against terrorism. It reviews U.S. policy and lead agency responsibilities as well as the impact on international law and American Civil liberties. It reviews current and possible future threats and makes recommendations regarding proactive measures the U.S. should be taking now to prevent successful terrorist attacks.