I think again, with respect to the sustainment and the lifespan of the P-8 assets, our understanding is that it has a long run ahead of it into the mid-2060s.
From a sustainment perspective, generally speaking, the more assets that are in service, the more readily available sustainment parts are. If you're dealing with a common fleet that is shared with allies, you generally have more ease of access to supply chains. We're feeling it on the CP-140 right now. As allies have divested, we have found it more and more challenging to find parts. You need a sustainment plan for sure. Ms. Gregory here has already talked about the potential economic benefits. My rule of thumb is that having common fleets amongst allies is a good risk mitigation measure for sustainment.
On the environmental question, we're going to have to come back to you, because regardless of the decision made, those are outstanding questions.