The Pentagon on Tuesday said classified data about the $399 billion F-35 fighter jet program remains secure, despite fresh documents released by NSA whistleblower Edward Snowden last week which said China stole “many terabytes” of data about the jet. The U.S. Defense Department’s F-35 program office said the latest documents released by the German magazine Der Spiegel “rehashed” a previously disclosed and reported 2010 incident, which it said compromised only non-classified data about the new warplane being built by Lockheed Martin Corp (LMT.N).