A US$14 billion Pentagon software upgrade for F-35 jets is being installed on aircraft that are deployed although it is “immature, deficient and insufficiently tested,” a new assessment by the military’s testing office said. Aircraft operators “identified deficiencies in weapons, fusion, communications and navigation, cybersecurity and targeting processes that required software modification and additional time and resources, which caused delays,” the 13-page assessment in the testing office’s annual report said. Built by Lockheed Martin, the F-35 is a flying computer, with more tha...