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Kathleen Martin

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While balloons were originally used for observation purposes, they were also used for offensive purposes.
In fact, the earliest uncrewed aerial vehicle was likely used in battle in 1849, when Austrian soldiers used unmanned balloons filled with explosives to attack the city of Venice. While a number of these weaponized balloons blew back and accidentally bombed the Austrian camps, several managed to reach their targets.
The technology was advanced during World War I when the first UAVs were developed in Britain and the USA. The British developed a small radio-controlled aircraft, called the Aerial Target, in 1917; while the American aerial torpedo known as the Kettering Bug first flew in October 1918. However, neither was used operationally during the war.
In the 1930s, the British produced radio-controlled aircraft for use as targets for training purposes. The term 'drone' may have been inspired by the name of one of these aircraft, the Queen Bee.
Reconnaissance UAVs were first used on a large scale during the Vietnam War. The U.S. utilized remote sensors and remote-controlled Firebees (a series of target drones) for surveillance. 
Since then, UAVs are regularly applied for surveillance, intelligence, and reconnaissance missions.
Continue reading: https://interestingengineering.com/5-ingenious-alternative-ways-we-can-make-use-of-drones
 

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