General Keith Alexander, commander of the U.S. Cyber Command, director of the National Security Agency (NSA) and chief of the Central Security Service (CSS), arrives at the Senate Appropriations Committee hearing on Cybersecurity: Preparing for and Responding to the Enduring Threat, on Capitol Hill in Washington June 12. "Great harm has already been done by opening this up, and the consequence, I believe, is [that] our security is jeopardized," Alexander said.