The Pentagon’s efforts to develop and deliver advanced Block 4 software capabilities to the F-35 Joint Strike Fighter have risen by more than half a billion dollars and are expected to extend into fiscal year 2029, a Government Accountability Office report released today shows. Primarily driving the $741 million increase in projected costs between 2020 and 2021, GAO found , are a $312 million growth tied to testing and lab upgrades and a $330 million jump in the price associated...