The ARRW program's future has been in doubt since a key test was unsuccessful a year ago, but one more test remains.
The F-35 Joint Program Office says the upgraded jet is showing software troubles in flight tests, prompting it to push the schedule back.
GhostEye MR is a medium-range radar that can detect, track and identify threats including cruise missiles and drones.
The Patriot can target aircraft, cruise missiles and shorter-range ballistic missiles. Russia has used that weaponry to bombard Ukraine.
By Adam Pemble
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