Uncrewed combat aerial vehicles (UCAV) are used by militaries worldwide for various functions, including surveillance, collecting intelligence, target acquisition, reconnaissance, and the delivery of ordnance such as missiles and bombs. There is a multitude of different types of drones currently in use by various armed forces.  These can be grouped into four general categories, starting with microdrones, such as the Black Hornet, measuring a mere 1-inch-by-4-inches, which British soldiers used to peek over walls in Afghanistan. Then there are small tactical drones, such
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