The top four chief of staff profiles.
In military hierarchies, there needs to be coordination across different levels of administrative and supervisory machinery. However, there is also a need for coordination among the various branches of the military at the top level. This function is coordinated in some large countries through a Joint chiefs of staff (JCS) Committee.
The JCS Committee is a top-level board of chiefs of staff of military branches who coordinate their strategic objectives with immediate tactical decisions. The position is often a rotating role between the different branches, with a different representative taking turns as chair of the JCS.
In the United States, the JCS comprises senior uniformed leaders of the United States Department of Defence. They act in an advisory capacity on military issues to the president of the United States, the Secretary of defence, the Homeland Security Council and the National Security Council.
Joint chiefs of staff has a legal definition by statute and consists of the chairman of the Joint chiefs of staff (CJCS), vice chairman of the Joint Chiefs of Staff (VCJCS), the chiefs of staff of the military branches: Army, Marine Corps, Navy, Air Force, Space Force, and the chief of the National Guard Bureau.
Each of the chiefs of staff of military branches, outside of their duties in the JCS, report and work directly for the Secretary of their military department.
The Joint Staff headquarters is located in the Pentagon. The origins of the JCS in the United States date back to the Joint Board system which was established in 1919 to coordinate between the army and navy.
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