Secretary of Defense Chuck Hagel, left, shakes hands with National Security Agency (NSA) Deputy Director Richard Ledgett March 28, 2014, at the NSA headquarters at Fort George G. Meade, Md. Hagel visited the facility to attend a retirement ceremony for U.S. Army Gen. Keith B. Alexander, who served as the director of the NSA during the last assignment of his 39-year Army career.