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gizmodo.com...
The Army's Biggest Tug Boat Can Haul an Entire Aircraft Carrier
It can tow "any vessel in the Army inventory," Stars and Stripes declared. "And can even pull an aircraft carrier." And with a service range of more than 5,000 nautical miles, the Nathanael Greene sextuplets can do so virtually anywhere in the world. [US Army - Global Sec - Stars and Stripes - Wiki 1, 2 - Hazy Grey - Google Books]