The same thing goes with salaries. The same thing goes with missions. When we bought the CF-18, we bought it to do some missions in general terms—NORAD, NATO, and so on. We didn't know when we bought the airplane that we'd be operating them in the liberation of Kuwait or that we'd be doing a bombing campaign in Kosovo, or helping out in Libya. These are the kinds of things we can't predict. Those change estimates into reality as the program unfolds.
My point is that all of these preliminary estimates will in fact change for a wide variety of reasons. Is that fair to say?