A key official within the Army Staff is the director of the Army Staff, who is a three-star general. The director is responsible for integrating and synchronizing the work of the Office of the Secretary and the Army Staff so that they meet the goals and priorities of the secretary of the Army. Other key figures within the Army Staff are the sergeant major of the Army, the United States Army judge advocate general, the chief of the Army Reserve, the United States Army provost marshal general, and the United States Army surgeon general. The chief of the National Guard Bureau was previously considered part of the Army Staff, but has been elevated to four-star rank and membership in the Joint Chiefs of Staff; the director of the Army National Guard and the director of the Air National Guard (both three-star positions) report to the chief, National Guard Bureau for strategy and policy, but receive funding and Service-specific guidance from their respective services.