Keith Alexander testifies before Congress on June 12, 2013
Courtesy Reuters

As General Keith Alexander prepares to depart from the federal government early next year, it’s important to note that he will be vacating not one job but two. He has earned plenty of attention for his role as director of the National Security Agency (NSA), the United States’ signals intelligence operation. But Alexander has concurrently served as head of Cyber Command, the cybersecurity command that the Pentagon established in 2010. This overlap was not an oversight; in fact, it was quite the opposite. Policymakers assumed that it would be efficient to have the same person run the two organizations, given

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