Soldiers inspect a car in ES3's virtual Irag. (Courtesy of the U.S. Army Simulator Training and Technology Center)

In Iraq and other conflict zones with unfamiliar cultures, U.S. soldiers can find it hard to identify threats and targets amid the hubbub of everyday life. Yet their interactions with locals yield far more information than intelligence officers could collect on their own -- hence the emerging military doctrine that "every soldier is a sensor."

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