An Air Force "hunter-killer" drone, the Reaper, takes off on a training mission at Creech Air Force Base in NevadaThe Scary Prospect Of Global Drone Warfare -- David Cortright, CNN
Drone technology is spreading rapidly. As many as 50 countries are developing or purchasing these systems, including China, Russia, India, Pakistan, and Iran.
Even non-state actors are involved. Hezbollah reportedly has deployed an Iranian-designed drone. Iran is developing a new drone aircraft with a range of more than 600 miles. These systems are used mostly for surveillance, but it is not difficult to equip the aircraft with missiles and bombs. Recently in Massachusetts, a man was arrested for plotting to place explosives on a drone aircraft and fly it into the Pentagon or the Capitol building. Private contractors are getting into the business as well. We now have companies offering drones-for-hire.
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My Comment: I am sure that one day we will be reading about one drone shooting down another drone .... but (in my opinion) that is far into the future.