Yeah honestly national symbol items being made locally just makes sense for so many reasons if possible and this is definitely possible. Especially since it should be the purpose of the national government to support internal functions and business before external whenever possible right?
With of course like allowments for maybe raw materials or specialized things if it’s not possible. I would get this feeling silly for a country like Vanuatu but the US has resources aplenty.
Plus in times of broken down supply lines it provides at least one manufacturing plant to rely on. This is also true of the military already for those reasons.