FILE - In this Sept. 23, 2010 file photo, Army Gen. Keith B. Alexander, commander of the U.S. Cyber Command, testifies on Capitol Hill in Washington. Foreign leaders are deterred from launching a major electronic attack on vital infrastructure in the U.S. because they know such a strike could be traced to its source and would generate a robust response, Alexander, the military's top cyber warrior said during congressional testimony Tuesday. (AP Photo/Manuel Balce Ceneta, File)

Associated Press
FILE - In this Sept. 23, 2010 file photo, Army Gen. Keith B. Alexander, commander of the U.S. Cyber Command, testifies on Capitol Hill in Washington. Foreign leaders are deterred from launching a major electronic attack on vital infrastructure in the U.S. because they know such a strike could be traced to its source and would generate a robust response, Alexander, the military's top cyber warrior said during congressional testimony Tuesday.   (AP Photo/Manuel Balce Ceneta, File)
FILE - In this Sept. 23, 2010 file photo, Army Gen. Keith B. Alexander, commander of the U.S. Cyber Command, testifies on Capitol Hill in Washington. Foreign leaders are deterred from launching a major electronic attack on vital infrastructure in the U.S. because they know such a strike could be traced to its source and would generate a robust response, Alexander, the military's top cyber warrior said during congressional testimony Tuesday. (AP Photo/Manuel Balce Ceneta, File)
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