There is an answer that is also valid that hasn’t been said yet.
All those skills and workers who were part of the original programs are no longer available. The tools and factories that made those parts are also not available.
Even if we have more technology now, it’s better to start from scratch then try to replicate an older rocket.
We have so many planes and tanks in the military that work very well. F-15s, c-130s. But we don’t make/buy those models anymore. Just spare parts.
The capacity to make them is lost to time and would take considerable amount of money to redo.
Those projects in the government took 5+ years with funding approved for those programs to finish.
In today’s climate, we can barely get a budget approved by congress.
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