Chief of the United States Army Reserve

The chief of the United States Army Reserve (CAR) is the commanding officer of the United States Army Reserve, the reserve component of the United States Army. As the highest-ranking officer in the United States Army Reserve, the CAR is the principal advisor to the chief of staff of the Army on all matters relating to the Army Reserve, and is responsible for the personnel, operations and construction budgets of the Army Reserve, subject to the supervision and control of the secretary of the Army.

Source: Wikipedia — Chief of the United States Army Reserve (CC BY-SA 4.0)