The United States Secretary of the Army, a civilian, leads the army with the help of the Army Chief of Staff, a general. Officially, a person (or member) in the army is called a soldier. The soldier must take orders from a person in charge known as a CO or commander. When a person joins the Army, they must serve for a certain amount of time or a "tour of duty". A new soldier or recruit must go through training called Basic Training to become a soldier. Each soldier is trained in a variety of weapons and equipment to carry out commands. 