Make-up and Control of the Army
Officially, a member of the US Army military is called a Soldier. The US Army is made up of three parts: the active component, the Reserve component, and the National Guard. The Army National Guard is composed of part-time soldiers organized by state and usually subordinate to the state governor, but can be federalized in a time of emergency.

The army is led by a civilian Secretary of the Army, who reports to the Secretary of Defense, as well as the US Army Chief of Staff, who is a member of the Joint Chiefs of Staff, the top ranking military commanders from each service who advise the President on military matters.

Operationally, though, control of the Army in wartime goes from the President of the United States to the Unified Combatant Commanders, who have control of all armed forces units in their geographic area of responsibility. Thus, the previously discussed figures only have the responsibility to train and equip the US Army.

The army gets its military recruits through a person known as an army recruiter. Recruiters are found in all branches of the military etc., army, navy, marines, national guard, air force, coast guard and reserves.  It would not be possible to have a volunteer army without army recruiters.