Chief of Staff of the United States Army
Overview
 
The Chief of Staff of the Army (acronym: CSA) is a statutory office held by a four-star general in the United States Army
United States Army
The United States Army is the main branch of the United States Armed Forces responsible for land-based military operations. It is the largest and oldest established branch of the U.S. military, and is one of seven U.S. uniformed services...

, and is the most senior uniformed officer assigned to serve in the Department of the Army
United States Department of the Army
The Department of the Army is one of the three military departments within the Department of Defense of the United States of America. The Department of the Army is the Federal Government agency which the United States Army is organized within, and it is led by the Secretary of the Army who has...

, and as such is the principal military advisor and a deputy to the Secretary of the Army
United States Secretary of the Army
The Secretary of the Army is a civilian official within the Department of Defense of the United States of America with statutory responsibility for all matters relating to the United States Army: manpower, personnel, reserve affairs, installations, environmental issues, weapons systems and...

; and is in a separate capacity a member of the Joint Chiefs of Staff
Joint Chiefs of Staff
The Joint Chiefs of Staff is a body of senior uniformed leaders in the United States Department of Defense who advise the Secretary of Defense, the Homeland Security Council, the National Security Council and the President on military matters...

 , and thereby a military advisor to the National Security Council
United States National Security Council
The White House National Security Council in the United States is the principal forum used by the President of the United States for considering national security and foreign policy matters with his senior national security advisors and Cabinet officials and is part of the Executive Office of the...

, the Secretary of Defense
United States Secretary of Defense
The Secretary of Defense is the head and chief executive officer of the Department of Defense of the United States of America. This position corresponds to what is generally known as a Defense Minister in other countries...

, and the President
President of the United States
The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....

. The Chief of Staff is typically the highest ranking officer on active-duty in the U.S.
 
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