The Chief Master Sergeant of the Air Force is a unique non-commissioned rank in the United States Air Force. The holder of this rank and position of office represents the highest enlisted level of leadership in the Air Force, unless an enlisted airman is serving as the senior enlisted advisor to the chairman. The CMSAF provides direction for the enlisted corps and represents their interests, as appropriate, to the American public, and to those in all levels of government. The CMSAF is appointed by the Air Force chief of staff (AF/CC) and serves as the senior enlisted advisor to the Air Force chief of staff and the secretary of the Air Force on all issues regarding the welfare, readiness, morale, and proper utilization and progress of the enlisted force.

The sergeant major of the Army (SMA) is a unique non-commissioned rank and position of office in the United States Army. The holder of this rank and position is the most senior enlisted soldier in the Army, unless an enlisted soldier is serving as the senior enlisted advisor to the chairman. The SMA is appointed to serve as a spokesman to address the issues of enlisted soldiers to all officers, from warrant officers and lieutenants to the Army's highest positions. As such, they are the senior enlisted advisor to the chief of staff of the Army. The exact duties vary depending on the chief of staff, though much of the SMA's time is spent traveling throughout the Army, observing training and talking with soldiers and their families.