By ROSS STAPLETON-GRAYCheap and varied, improvised explosive devices (IEDs) have killed more U.S. troops in Iraq and Afghanistan than any other weapon. The Pentagon is funding at least a half dozen proposed ways of finding the bombs before they go off.
These include detecting chemical and electronic signatures, identifying trigger transmitters, finding the explosives themselves with earth-penetrating and multispectral scanning technologies, and recognizing bomb-related activities that indicate an imminent attack.
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