The Department of the Army Law and Legal Definition

The U.S. Department of Army is one of the departments of the U.S. department of defense. The U.S. Department of Army was formed in the year 1789. Earlier the department was known as the U.S. Department of War. In 1947, the name was changed to the U.S. Department of Army. The Department of the Army is one of the three service departments in the U.S. Department of Defense. It is headed by the Secretary of the Army who is responsible for administrative affairs of the U.S. Army. The highest ranking military officer in the department is the Chief of Staff of the Army. Headquarters, Department of the Army is the highest level headquarters in the department and exercises directive and supervisory control over it.