Book excerpt: Terrorism: Commentary on Security Documents is a series that provides primary source documents and expert commentary on various topics relating to the worldwide effort to combat terrorism, as well as efforts by the United States and other nations to protect their national security interests. Volume 144, Autonomous and Semiautonomous Weapons Systems, examines the impact of robots and autonomous and semiautonomous weapons systems on the waging of modern warfare. It considers the likely effects of emerging technological innovations in this area from both a political and strategic standpoint, in addition to considering the implications of such technologies within the context of the law of armed conflict and international humanitarian law. This volume is divided into three sections: (1) U.S. policy and approaches to the use of autonomous and semiautonomous weapons systems; (2) U.S. armed forces use of such weapons systems; and (3) potential terrorist use of such weapons systems. Official policy documents from the DoD and the U.S. Army and Air Force are complemented by reports from the Strategic Studies Institute/Army War College Press and other U.S. military sources.