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History of unmanned aerial vehicles
An Unmanned aerial vehicle (UAV) is a type of aircraft which has no onboard crew or passengers. UAVs include both autonomous drones and remotely piloted vehicles (RPVs). A UAV is capable of controlled, sustained level flight and is powered by a jet, reciprocating, or electric engine. In the 21st century, technology reached a point of sophistication that the UAV is now being given a greatly expanded role in many areas of aviation.
A UAV differs from a cruise missile in that a UAV is intended to be recovered after its mission, while a cruise missile impacts its target. A military UAV may carry and fire munitions on board, while a cruise missile is a munition.
==Early development==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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