What were the original five NCO ranks?

The correct option reflects the historical context and the traditional structure of the Non-Commissioned Officer (NCO) ranks within the United States Army. Originally, the five NCO ranks included Corporal, Sergeant, First Sergeant, Quartermaster Sergeant, and Sergeant Major.

Each of these ranks plays a specific role within the NCO leadership framework. The Corporal and Sergeant serve as the first line of leadership, responsible for guiding and mentoring junior soldiers. The First Sergeant and Quartermaster Sergeant typically hold more specialized leadership roles, particularly in managing troops and equipment logistics, while the Sergeant Major serves as a senior advisor and leader of NCOs at higher levels.

Understanding this hierarchy is crucial for effective teamwork and the overall functioning of military units, especially as NCOs are essential in bridging the gap between enlisted personnel and commissioned officers. This historical significance and the operational structure substantiate why this option accurately encapsulates the original NCO ranks in the Army.