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Letters that soldiers write home help future generations better understand the nature of warfare and the sacrifices made by the men and women who serve the country. But with the Internet available to most troops in Iraq, war correspondence is changing. E-mail is fast replacing handwritten letters.

Today we speak with Andrew Carroll, editor of War Letters: Extraordinary Correspondence from American Wars. That book served as the basis for the film "War Letters" that aired on the American Experience on PBS. He's in the middle of a trip to more than 30 countries, talking with soldiers and collecting their correspondence. We reached him in Beijing.