All the talk of benchmarks for American performance in Iraq makes me wonder if we shouldn't reverse them.
Tell the Iraqis as a nation, for every week that goes by without a (well-defined) terrorist incident, we will pull out 1,000 troops. (We need at least one fine-grained condition that is likely to happen, so we can actually do it, and show that we are serious.) Serious terrorist events may pull troops back or delay our leaving.