Gen. Keith B. Alexander, director of the National Security Agency and head of the U.S. Cyber Command, arrives on Capitol Hill in Washington, Wednesday, June 12, 2013, to testify before the Senate Appropriations Committee, his first public appearance since revelations that the electronic surveillance agency is sweeping up Americans' phone and Internet records in its quest to investigate terrorist threats. He is joined by Rand Beers, seated at right, the under secretary for the Department of Homeland Security.  (AP Photo/J. Scott Applewhite)