I'll try to answer this in part, and then I'll pass it over to General Hillier.
At the moment, our commitment is to the end of February 2009. We've made no judgment beyond that. As a country, we have that commitment to NATO. We may be longer—who knows?—but I think government will make that decision somewhere in 2008.
Regarding the commitment we have right now to the end of February 2009, we are trying as best as possible—given that we're trying to increase the military at the same time—to ensure that most people don't go back to Afghanistan, to the combat area, within that timeframe. That is, for those who started in early 2006, we should have enough people—there are exceptions in some support trades—if we do our recruiting right and reassign people in the armed forces, to get us through to the end of February 2009 without committing large numbers of troops back in that zone again. I don't anticipate anybody being there five or six times. There could be some exceptional person, but I don't think that's very likely.
I'll hand over to CDS.