An unmanned aerial vehicle (UAV), commonly known as a drone and also referred to as an unpiloted aerial vehicle and a remotely piloted aircraft (RPA) by the International Civil Aviation Organization (ICAO), is an aircraft without a human pilot aboard. ICAO classify unmanned aircraft into two types under Circular 328 AN/190: Autonomous aircraftcurrently considered unsuitable for regulation due to legal and liability issues Remotely piloted aircraftsubject to civil regulation under ICAO and under the relevant national aviation authority There are many different names for these aircraft. They are UAV (unpiloted aerial vehicle), RPAS (remote piloted aircraft systems) and model aircraft. It has also become popular to refer to them as drones. Their flight is controlled either autonomously by onboard computers or by the remote control of a pilot on the ground or in another vehicle. The typical launch and recovery method of an unmanned aircraft is by the function of an automatic system or an external operator on the ground. Historically, UAVs were simple remotely piloted aircraft, but autonomous control is increasingly being employed.. One of the best known and widely used types was the Nazi-German V-1, that flew autonomously powered by a pulse jet. Its successor was the Nazi-German V-2, also autonomous but rocket powered, and partly functioning ballistically. They are usually deployed for military and special operation applications, but also used in a small but 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.