The Chief of Staff of the Air Force (acronym: CSAF, or AF/CC) is a statutory office (10 U.S.C. § 9033) held by a four-star general in the United States Air Force, and as such is the principal military advisor to the Secretary of the Air Force for Air Force activities; and is in a separate capacity a member of the Joint Chiefs of Staff, and thereby a military adviser to the National Security Council, the Secretary of Defense, and the President. The Chief of Staff is typically the highest-ranking officer on active duty in the Air Force unless the Chairman and/or the Vice Chairman of the Joint Chiefs of Staff are Air Force officers.