Now, in terms of the 20 years, you're saying that DND used 20 years. DND has always used 20 years, in my experience with DND. We certainly used that for the CF-18 when that came out. We've used it I think for every capital air program I'm aware of.
The reason for that is, I suggest, in asking you the question, do we know what it's going to cost to operate the CF-18 for 40 years? I think the answer is no, because we're not there yet. The closer we get, the smarter we get.
So as for projecting ahead to operate the F-35 for 20, 30, or 40 years, do we know what the cost of fuel is going to be in 20 years, 30 years, or 40 years?