U.S. Cyber Command Commander, National Security Agency Director and Central Security Service Chief General Keith Alexander gestures during a news conference in Washington, Wednesday, Feb. 13, 2013, to give an update on President Barack Obama&#39;s Cybersecurity policy. Warning that American companies are the target of an intensive cyber-espionage campaign, President Barack Obama&#39;s top security officials on Wednesday said they are struggling to defend the nation from attacks on its private computer networks and called on Congress to pass legislation that would close regulatory gaps. (AP Photo/Ann Heisenfelt)