An unmanned aerial vehicle (UAV), commonly known as a drone, is an aircraft without a human pilot aboard. Its flight is controlled either autonomously by onboard computers or by the remote control of a pilot on the ground or in another vehicle. ICAO classify unmanned aircraft into two types under Circular 328 AN/190...They are usually deployed for military and special operation applications, but also used in a growing number of civil applications,^]such as policing and firefighting, and nonmilitary security work, such as inspection of power or pipelines. UAVs are often preferred for missions that are too "dull, dirty or dangerous" for manned aircraft.