The director of the National Security Agency, Gen. Keith Alexander, is stepping down next spring and a deputy director will leave in the coming months. Alexander's departure, according to the NSA, is not related to the Edward Snowden data leak and agency surveillance revelations. Alexander also is chief of U.S. Cyber Command. One potential candidate to replace Alexander is Vice Adm. Michael Rogers, who now oversees the Navy's U.S. 10th Fleet and U.S. Fleet Cyber Command.

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