The Director of the National Security Agency, also known as DIRNSA, is the highest-ranking official within the National Security Agency. The Director of the NSA also concurrently serves as Chief of the Central Security Service (CCSS) and as Commander, U.S. Cyber Command (USCYBERCOM). According to of the U.S. Code of law, the DIRNSA/CCSS/CDRUSCYBERCOM is recommended by the Secretary of Defense and nominated for appointment by the President of the United States. The nominee must be confirmed via majority vote by the Senate. In accordance with Department of Defense Directive 5100.20, dated December 23, 1971, the Director of the NSA must always be a commissioned officer of the military services. Because the assignment is currently part of a tri-hatted position, the Director of the NSA is appointed to the grade of a four-star general or admiral during the period of his incumbency. The Deputy Director is always a technically-experienced civilian.