Issue Date: September 21, 2009
As two soldiers approach a remote base near the Pakistan-Afghanistan border after a long trek through hostile territory, a laser beam zigzags across unusual-looking badges on their vests. The beam is emanating from a Raman instrument that checks the men for worrisome substances. If the troops have been exposed to pathogens or chemical warfare agents while on patrol, an alarm will sound before they can reach the base, and their comrades will rush to decontaminate . . .
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