Preserve it. Its part of history.
As long as it doesn’t come out of my tax dollars and/or the US DOD budget.
I'd say it's certainly up to the French to decide. As for my opinion: imagine if China, Russia, or some other nation invaded the US and built something of significance. During this period, they not only killed many of us but humiliated us as a nation. Created a "brand", so to speak, of a weak and inconsequential America.
I would hope we would take to demolishing any such monument to our disgrace the minute we drove them out.