Cyber spies have broken into the Pentagon’s $300 billion Joint Strike Fighter project – the defense department’s costliest weapons program ever, according to the lead item in today’s Wall Street Journal. From the story: Similar incidents have also breached the Air Force’s air-traffic-control system in recent months, these people say. In the case of the fighter-jet program, the intruders were able to copy and siphon off several terabytes of data related to design and electronics systems, officials say, potentially making it easier to defend against the craft. Attacks like these — or U.S. awareness of them — appear to have escalated in the past six months, said one former official briefed on the matter. “There’s never been anything like it,” this person said, adding that other military and civilian agencies as well as private companies are affected. “It’s everything that keeps this country going. The disclosure is the latest tale