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Drones may one day develop the capacity to carry out targeted killings in swarms. But militaries are not certain to adopt such technology, says Jack Watling, a senior fellow at the Royal United Services Institute. Their reluctance would be more about expense than ethics. “If you think about the logistics of having a lot of sophisticated drones that can pick out individuals, process the data, communicate with each other, navigate a city … there’s a lot of moving parts to that and it’s very expensive,” Watling says.