The Navy's navies

An Unmanned Patrol Boat in trials.
Photo: U S Navy, John F Williams

  The U S Navy has successfully shown off it's new Unmanned Patrol Boat in trials held near Washington DC.
  The boats are a means of protection for Navy Ships during things such as at-sea refueling.  The new boats can be used to form "swarms" to protect a group of ships or an area of territory, and I'm guessing, minesweeping operations.
  Read much more: http://www.msn.com/en-us/news/technology/navy-self-guided-unmanned-patrol-boats-make-debut/ar-BB7A4j0

Unmanned boats getting ready to swarm
Photo: U S Navy, John Paul Kotara