The director of the National Security Agency (DIRNSA) is the highest-ranking official of the National Security Agency, which is a defense agency within the U.S. Department of Defense. The director of the NSA also concurrently serves as the chief of the Central Security Service (CSS) and as the commander of U.S. Cyber Command (USCYBERCOM). As the director of the NSA and the chief of the CSS, the officeholder reports to the under secretary of defense for intelligence, and as the commander of U.S. Cyber Command, the officeholder reports directly to the secretary of defense.