Following on from that, one of the important aspects of having a domestic shipbuilding industry is that it helps to maintain the skills in the industry, both in terms of the hand skills in the trained labour, but also in the systems integration skills, which are so necessary to be able to upgrade and modify the ships in service, and that's certainly a requirement domestically.
So from a point of view of ongoing construction, it is of advantage to the navy to be able to forecast steady-state naval requirements, to look ahead at replacing the classes of ships, not so much as an individual class-by-class replacement, but look at it strategically as a replacement or an ongoing renewal of the navy as a system.