Subheadline: Chinese hackers pillaged U.S. defense, contractor networks for critical data China obtained more than 50 terabytes of data from U.S. defense and government networks, notably the Joint Strike Fighter’s stealth radar and engine secrets, through cyber espionage, according to newly disclosed National Security Agency documents. A NSA briefing slide labeled “Top Secret” and headlined “Chinese Exfiltrate Sensitive Military Data,” states that the Chinese have stolen a massive amount of data from U.S. government and private contractors. The document was made public by the German magazine Der Spiegel in a two articles detailing how NSA in the mid-2000s was capable...