If you look at Electric Boat Company (they make our subs), and Newport News Shipyards(carriers), there is a big reason they get refit work etc. Because they would collapse as an industry and it would be impossible to build that kind of staffing/expertise up in short order again.
This fact is supposedly a part of the reason the f35 went to lockheed vs boeing.
It's also half the reason behind the Jones Act. Shipping between US ports must be done with US-made ships with US crews. If it weren't for this, US shipyards wouldn't have enough orders or expertise to stay open, and thus wouldn't be available for military orders in case of war.
This fact is supposedly a part of the reason the f35 went to lockheed vs boeing.