International computer spies have broken into the Pentagon's Joint Strike Fighter Project. The $300 billion program is the military's costliest weapons project ever. The intruders into the Fighter Project were able to copy data related to design and electronic systems of the planes, potentially making it easier to defend against the craft. Recently, similar cyber-attacks have breached the Air Force's air-traffic-control system. While those directly responsible for this attack could not be identified, many former officials claim the move bears the hallmarks of previous encounters with China. For more we turn to the reporter responsible for breaking this story, Siobhan Gorman, Intelligence Correspondent for the Wall Street Journal.