Sustainability is certainly a key part. When we purchase large-scale military platforms and equipment, we expect them to last for decades. That's been the trend going back to the sixties, and this is the vision that has been adopted for this particular ambitious project. We're not the only ones doing this. That's why the ability to have a domestic capability and to understand how to sustain and modify those ships for decades is so important.
Our challenge is that we have effectively two mini navies and two defence industrial bases, one on each coast, because you can't simply move a ship around from one port to another. That is a tremendous project management challenge, and it is a tremendous extra cost. It's about whether we seriously want to have a three-ocean navy and, ideally, year-round, a two-ocean navy—