No. I think the question is that when you look at the assets employed for national security purposes, they are outside of what I'll call the core departmental emissions. As I've indicated, there's lots of discussion with industry about what you do to make those types of fuels more efficient, more green, but that's work still to come.
One of the key things you look at from a defence perspective is operational requirements. The military and the air force would obviously need planes to fly, and so I don't view grounding fleets as an option on that front. It's more a question back to industry; that is, what can you do to make your products greener as time goes on?