Special report: The Pentagon's new cyber warriors

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2Lt William Liggett (L) talks with a colleague as a map is displayed on one of the screens at the Air Force Space Command Network Operations & Security Center at Peterson Air Force Base in Colorado Springs, Colorado July 20, 2010. U.S. officials have shown increasing concern about alleged Chinese and Russian penetrations of the electricity grid, which depends on the Internet to function. The Pentagon in recent weeks has begun pushing to put civilian infrastructure under its wing in a proposed cyber realm walled off from the rest of the Internet. REUTERS/Rick Wilking