Sir, if I just may say, we're principally trying to respond to our report and our methodology. So your point is well taken. There may be other approaches. But we used 30 years for very specific reasons: because it's the estimated service life based on the U.S. Department of Defense and it also happens to correspond to the useful service life of the F-18.
The other issue is that if you take the service life estimated by Lockheed Martin for the aircraft—8,000 hours divided by the average flying hours—it also gives you a number over 30. A lot of the methodology.... To go to Mr. Saxton's very good question, we consulted with a wide range of experts, including the peer reviewers, the Congressional Budget Office, Queen's University, and the Australian Strategic Policy Institute. This was the advice we got about what's conventional.
When we can appeal to an authority like the U.S. Department of Defense Selected Acquisition Report, we use things that are most conventional, so definitions that come out of the cost analysis guidance procedures, which is the basis of our engagement with our consultants. So we tried to stay as close as we could to those standard practices, in particular since it was U.S. procurement with the U.S defense department's practices.