At an event for the Campaign to Stop Killer Robots in London, April 2013
Luke MacGregor / Courtesy Reuters

More and more, machines are waging war. Unmanned craft conduct reconnaissance and serve as mechanical beasts of burden over inhospitable terrain, and other automated systems assist medics and defuse explosives. But when it comes to weaponized systems, governments have so far kept humans as the operators. Now militaries worldwide are taking steps to develop armed autonomous robots with the capacity to use lethal force on their own. According to a U.N. report, Israel, South Korea, the United Kingdom, and the United States have developed weapons systems with various degrees of autonomy. Since 2010, for example, armed sentry robots with autonomous sensors and targeting systems have patrolled South Korea’s demilitarized zone. Although humans are still behind the controls, military doctrine leaves open the possibility of fully autonomous weapons in the future. The U.S. Department of Defense’s Directive on Autonomous Weapons permits under-secretaries of defense, in certain cases, to

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  • CHARLI CARPENTER is an associate professor of political science at the University of Massachusetts–Amherst and the author of two books on the protection of civilians. She blogs about human security at
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