There are already several people working on collective autonomous UAVs. Example: http://www.nature.com/news/autonomous-drones-flock-like-birds-1.14776 http://ww

There are already several people working on collective autonomous UAVs. Example: http://www.nature.com/news/autonomous-drones-flock-like-birds-1.14776 http://www.nature.com/news/autonomous-drones-flock-like-bird... A "flock" of light unarmed vehicles surrounding with one or more armed vehicles that drop in and out of the flock to do their thing would likely be extremely difficult to deal with.