The F-35 Joint Program Office's efforts to upgrade jets with Block 4 software are "deficient" and its goal of concluding Joint Simulation Environment testing later this year is "at risk," according to a new Pentagon report. Release of modernized capabilities in Block 4 brought on by Technology Refresh 3 (TR-3) hardware were recently revealed to be delayed again following an announcement by JPO of the first developmental flight test earlier this month. And with 64 trials for the JSE remaining,...