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General Keith Alexander, commander of the U.S. Cyber Command, director of the National Security Agency (NSA) and chief of the Central Security Service (CSS), arrives at the Senate Appropriations Committee hearing on Cybersecurity: Preparing for and Responding to the Enduring Threat, on Capitol Hill in Washington June 12, 2013. REUTERS/Yuri Gripas (UNITED STATES - Tags: POLITICS MILITARY SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY) - RTX10LF4 Yuri Gripas/Reuters