chief of staff


  1. the senior officer of the U.S. Army or Air Force, a member of the Joint Chiefs of Staff, responsible to the secretary of a service branch.
  2. (lowercase) the senior or principal staff officer in a brigade or division or higher unit in the U.S. Army or Marine Corps, in a numbered unit in the U.S. Air Force, or in a unit in the U.S. Navy commanded by a rear admiral or one of higher rank.
  3. (lowercase) the senior officer in command of a general staff, especially that of the military forces of a nation.
  4. (lowercase) the head of any staff: the chief of staff for the First Lady.


  1. the senior staff officer under the commander of a major military formation or organization
  2. the senior officer of each service of the armed forces

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