America has set up its new Cyber Command both to defend its networks and devise attacks on its enemies.

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In a previous position that Bishop held from May 2010 to April 2012, Bishop had access to "top secret" information on the command's efforts to defend against a ballistic missile attack from North Korea, Crutchfield said.

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The U.S. Cyber Command also has more powerful tools to fight and defend against cyber attacks than does the DHS, a potential problem when time is of the essence during an attack.

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General Keith Alexander, who also heads U.S. Cyber Command, says the current patchwork of 15, 000 military networks is too unwieldy to defend.

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