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In 2001, the Pentagon had just 200 robotic aircraft. In 2008 it had more than 5,000. The number of military ground robots jumped from 160 in 2004 to around 4,000 in 2006. Only underwater robots lagged: so far just a few dozen systems have entered service. Under the water is, after all, the toughest environment for robots. But even undersea bots will see a boost in coming years. The Pentagon has pl... goodreads.com