Okay. Thank you.
Mr. Byers, you and Mr. Fergusson both talked about the ballistic missile defence program. You seem to have competing views on it. You both mentioned that there's a cost associated with it.
I'm curious, from your position on it, if either of you have a sense as to what the actual cost is going to be. That seems to either be a deterrent, quite often, or something that is encouraging us to go down that route.
Mr. Fergusson, would you like to provide an answer to that, first.