When drones - at the beginning essentially designed for intelligence missions - came of age and started to become reasonably reliable, it was obvious that someone was sooner or later going to think about arming them. Unsurprisingly aeroplanes during the First World War followed a similar application path as they were first used to spy over enemy lines for artillery spotting missions and it is only a little later that it occurred to someone that the aircraft's observer could also toss a few bombs overboard. On board guns came even later.
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