After the past decade’s explosive growth, it may seem that the U.S. is the only country with missile-carrying drones. In fact, the U.S. is losing interest in further developing armed drone technology. The military plans to spend $2.4 billion on unmanned aerial vehicles, or UAVs, in 2015. That’s down considerably from the $5.7 billion that the military requested in the 2013 budget. Other countries, conversely, have shown growing interest in making unmanned robot technology as deadly as possible.