The Pentagon is planning a 30% increase in its fleet of armed unmanned aircraft, so we thought we’d introduce you to the X-47B, one of the coolest new drones in development. It’s a tailless, fighter-sized craft that operates without a pilot — in the cockpit or on the ground — that can carry 4,500 pounds of weapons, land on its own and, by 2014, will be able to refuel itself.