FORT MEADE, MD - MARCH 13:  U.S. Secretary of Defense Ash Carter delivers remarks to an audience of U.S. Cyber Command troops and National Security Agency employees while visiting the NSA and command headquarters March 13, 2015 in Fort Meade, Maryland. Carter emphasized the importance of military cyber operations by making this his first visit with soliders, sailors, airmen and Marines inside the United States since becoming defense secretary in February 2015.  (Photo by Chip Somodevilla/Getty Images)