The US Air Force is considering contingency plans that would extend the life of 1970s-era intercontinental ballistic missiles ...
The previous strategy included keeping the Boeing-made 400 Minuteman III ICBMs in silos until 2039 and gradually replace them ...
But the Air Force and lead contractor Northrop Grumman Corp. must manage the elaborate process to take out the older missiles, refurbish the silos and then install Sentinels — a nuclear missile ...
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