WASHINGTON, Feb. 8, 2006 – In the old Star Wars movie "The Empire Strikes Back," Luke Skywalker gets a new, fully functional right hand after Darth Vader chops his off with a light saber. Today, thanks to work under way through the Defense Advanced Research Projects Agency, servicemembers who have lost limbs in the line of duty could experience something almost as revolutionary in the years ahead. Among the cutting-edge technology DARPA is developing is a highly advanced, mechanical arm that works and looks just like a human one, Jan Walker, a DARPA spokesperson, told the American Forces Press Service....