America's fleet of robotic drone warships, the Ghost Fleet Overlord, made headlines late last year when four of the vessels wrapped up a six-month tour in the Pacific, including autonomous port visits to Japan and Australia.

Last week, the ghost fleet was in the news again, with the announcement that it had grown with the launch of a fifth robotic warship, the Vanguard (designated OUSV 3).

Image source: Getty Images.

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Source Fool.com