About two and a half million men and women serve in the U.S. military. These days, it's a job that almost certainly involves serving in a war zone, as American soldiers continue to fight in Iraq and Afghanistan. So who chooses to serve in the volunteer military? In many cases, it's not people without other options. [Editor's note (9/23/2008): The number of men and women serving in the military was corrected.] Guest: Stephen Dubner, co-author of the Freakonomics book and blog

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