Drone warfare is one of the most important trends in twenty-first-century conflict. This chapter surveys the history of drones – nonpiloted aircraft – and describes their basic features and how they differ from piloted aircraft and missiles. It assesses the advantages and disadvantages of using drones. The advantages include circumvention of some operational crew limitations; longer flight times; plausible deniability; and avoidance of friendly casualties. Whether drone strikes are effective, especially against terrorist and militant groups, is also considered. The chapter next works through the interwoven question of whether (certain types of) drone strikes are legal and/or ethical. It then turns to the political dimensions of how they are authorized, especially their implications for the separation of powers.The chapter then turns to the spread of drones to state and nonstate actors, and the frontiers in the future development of drone technology. The chapter applies many of these concepts to a quantitative study of whether drone strikes reduce terrorism, and a case study of US drone strikes on targets on Pakistani territory in the 2000s and 2010s.
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