Director of National Intelligence James Clapper (center), accompanied by FBI Director Robert Mueller (left) and CIA Director John Brennan, testifies on Capitol Hill on March 12, 2013. When questioned, Clapper said the NSA did not collect data on Americans. He later acknowledged his response was "clearly erroneous." Susan Walsh/AP hide caption

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Lt. Gen. Michael Flynn, the director of the Defense Intelligence Agency, testifies before the Senate Armed Services Committee last month. Lauren Victoria Burke/AP hide caption

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Vice Adm. Ted Branch, the director of naval intelligence, was one of two top officers to have their access to classified material suspended. /U.S. Navy hide caption

itoggle caption /U.S. Navy

Pakistani Army soldiers guard nuclear-capable missiles at the International Defence Exhibition in Karachi in 2008. The Washington Post reports that concern over their security is a "blind spot" in U.S. intelligence efforts. Rizwan Tabassum/AFP/Getty Images hide caption

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Teacher Denise Severing leads a math lesson at a Head Start school in Woodbourne, New York. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images