The F-35 Joint Strike Fighter Joint Program Office has yet to establish a plan to test the jet's new Technology Refresh 3 software and associated Block 4 hardware upgrades, despite aircraft enabled with a truncated version of the configuration already being delivered to field units, the Pentagon's top weapons tester said in a Jan. 31 report. “The limitations in terms of combat capability of these aircraft are not known, nor is the timeline on which the previously fielded capabilities (on...