"We devote this volume to an examination of the apparent shift in the use of force in defending U.S. interests and in furthering U.S. national security policy. The nation's use of unmanned aerial vehicles, in lieu of more conventional military capabilities, has been increasing significantly since the beginning of the century. Commonly referred to as drones, these surveillance and weapons systems appear to offer many advantages. They allow the United States to apply force in areas otherwise inaccessible to military units. ... drones ... are beginning to be used domestically for law enforcement purposes. This volume on drones focuses on international use of the systems. The following volume will address domestic use of drones"--