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Consider these data: Between November 2004 and February 2005, according to the Brookings Institution's Iraq Index, the number of coalition soldiers in Iraq rose by 18,000. In that time, the number of Iraqi civilians killed fell by two-thirds, and the number of American troops wounded fell by three-fourths. The soldiers were soon pulled out; by the summer of 2005, American and Iraqi casualties rose again. Later that year, the same thing happened again. Between September and November of 2005, another 23,000 soldiers were deployed in Iraq; once again, both Iraqi and American casualties fell. In the early months of 2006, the number of soldiers fell again, and casualties spiraled up.
The picture is clear: More soldiers mean less violence, hence fewer casualties. The larger the manpower investment in the war, the smaller the war's cost, to Iraqis and Americans alike. Iraq is not an unwinnable war: Rather, as the data just cited show, it is a war we have chosen not to win. And the difference between success and failure is not 300,000 more soldiers, as some would have it. One-tenth that number would make a large difference, and has done so in the past. One-sixth would likely prove decisive.