* Unmanned aircraft, known variously as "drones", "remotely piloted vehicles (RPVs)", and now "unmanned aerial vehicles (UAVs)", have been a feature of aviation for much of its history, though in limited or secondary roles. In the 21st century, the technology seems to be headed towards greatly expanded use. This document provides a history of UAV technology, focused on American efforts in the field. UAV developments in other nations are discussed in separate documents.
