A man takes a photograph with his cell phone of names on the walls of "Empty Sky Memorial" at Liberty State Park in Jersey City, New Jersey. The concrete and steel memoria pays tribute to the 746 citizens of New Jersey who lost their lives on Sept. 11. Justin Sullivan/Getty Images hide caption

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National Security Agency (NSA) headquarters at Fort Meade, Maryland, January 2010. SAUL LOEB/AFP/Getty Images hide caption

itoggle caption SAUL LOEB/AFP/Getty Images