The F-35 stealth fighter jet suffers from hundreds of problems and won’t be fully combat-capable before 2020, says a scathing report from the Pentagon’s top evaluator. New issues keep cropping up, and fixing them all may cost over $1 billion. Dr. Michael Gilmore’s damning assessment is part of the massive annual report for fiscal year 2016, and his 62-page dossier devoted to the F-35 paints...