<P> The Chief of Staff of the Army (CSA) is a statutory office (10 U.S.C. § 3033) held by a four - star general in the United States Army . As the most senior uniformed officer assigned to serve in the Department of the Army, the CSA is the principal military advisor and a deputy to the Secretary of the Army . In a separate capacity, the CSA is a member of the Joint Chiefs of Staff (10 U.S.C. § 151) and, thereby, a military advisor to the National Security Council, the Secretary of Defense, and the President of the United States . The CSA is typically the highest - ranking officer on active - duty in the U.S. Army unless the Chairman and / or the Vice Chairman of the Joint Chiefs of Staff are Army officers . </P> <P> The Chief of Staff of the Army is an administrative position based in the Pentagon . While the CSA does not have operational command authority over Army forces proper (which is within the purview of the Combatant Commanders who report to the Secretary of Defense), the CSA does exercise supervision of army units and organizations as the designee of the Secretary of the Army . </P> <P> The current Chief of Staff of the Army is General Mark A. Milley . </P> <P> The senior leadership of the Department of the Army consists of two civilians, the Secretary of the Army (Head of the department and subordinate to the Secretary of Defense) and the Under Secretary of the Army, and two military officers, the Chief of Staff of the Army and the Vice Chief of Staff of the Army . </P>

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