Unmanned aerial vehicle
An unmanned aerial vehicle (UAV), also known as a unmanned aircraft system (UAS), remotely piloted aircraft (RPA) or unmanned aircraft, is a machine which functions either by the remote control of a navigator
A navigator is the person on board a ship or aircraft responsible for its navigation. The navigator's primary responsibility is to be aware of ship or aircraft position at all times. Responsibilities include planning the journey, advising the Captain or aircraft Commander of estimated timing to...

 or pilot
An aviator is a person who flies an aircraft. The first recorded use of the term was in 1887, as a variation of 'aviation', from the Latin avis , coined in 1863 by G. de la Landelle in Aviation Ou Navigation Aérienne...

 (called a Combat Systems Officer on UCAVs) or autonomously, that is, as a self-directing entity. Their largest use is within military
A military is an organization authorized by its greater society to use lethal force, usually including use of weapons, in defending its country by combating actual or perceived threats. The military may have additional functions of use to its greater society, such as advancing a political agenda e.g...

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