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Unmanned Aerial Vehicles (UAVs) are remotely piloted or self-piloted aircraft that can carry cameras, sensors, communications equipment or other payloads. They have been used in a reconnaissance and intelligence-gathering role since the 1950s, and more challenging roles are envisioned, including combat missions. Unmanned aerial vehicles are classified according to two primary categories--Tactical and Endurance. Tactical unmanned aerial vehicles typically have a flight time of 10 hours or less and an operating radius no greater than 150 miles. Endurance unmanned aerial vehicles exceed these capabilities. The often promised widespread use of UAVs in the global civilian market has generally not yet been realised.
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