ICBM's and ABM's are not things you manufacture in an emergency during warfare, which is what the OP was talking about. If we need to overall our ICBM's and/or adopt new technologies, we can do that during peace time, and during peace time we can and do rely on manufacturing in other countries for portions of what we build. The OP's point is that things like ships/tanks/planes, i.e. war production, couldn't be done during a major and sustained conventional conflict. I just don't see that happening. Frankly, I don't know that we need that much more conventional military than is necessary to defend our borders.