Definition of chief of staff 1 : the ranking officer of a staff in the armed forces serving as principal adviser to a commander. 2 : the ranking officer of the army or air force and a member of the Joint Chiefs of Staff.

What do you mean by chief of staff?

Definition of chief of staff 1 : the ranking officer of a staff in the armed forces serving as principal adviser to a commander. 2 : the ranking officer of the army or air force and a member of the Joint Chiefs of Staff.

What rank is chief staff?

By statute, the chief is appointed as a four-star general.