U.S. Cyber Command

Alexander NSA.jpg

**FILE** Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, testifies before the House Permanent Select Committee on Intelligence on Capitol Hill in Washington on June 18, 2013. (Associated Press)

NSA_Surveillance_Live.jpg

Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, testifies on Capitol Hill in Washington on June 18, 2013, before the House Permanent Select Committee on Intelligence. (Associated Press)

NSA Surveillance_Live.jpg

**FILE** Gen. Keith B. Alexander, commander of the U.S. Cyber Command and director of the National Security Agency, testifies on Capitol Hill in Washington on June 12, 2013. (Associated Press)

6_122013_nsa-surveillance-38201.jpg

Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, said on Wednesday he would discuss specific foiled terrorist plots in more detail Thursday during a closed congressional hearing on the NSA leak. (Associated Press)

20120711-165625-pic-571352558.jpg

Army Gen. Keith B. Alexander, chief of U.S. Cyber Command, this week told a Chinese reporter that he thinks "defending our country in cyberspace is one of our most important missions ... to ensure that we're secure." (Associated Press)

20120425-191329-pic-589940033.jpg

Launching a cyberattack requires "enormous amounts of intelligence, planning, great care," says Rear Adm. Samuel J. Cox, director of intelligence at U.S. Cyber Command. (Associated Press)