Which ranks were considered the original NCO ranks?

The correct answer encompasses the ranks that have historically been recognized as the foundation of the Non-Commissioned Officer (NCO) structure. In the U.S. Army, the ranks of Corporal, Sergeant, First Sergeant, Quartermaster Sergeant, and Sergeant Major were established as essential roles within the NCO tier. These ranks emphasize both leadership and technical expertise, serving as the backbone of unit cohesion and discipline.

Corporal and Sergeant are fundamental NCO ranks that provide the initial leadership training and responsibilities to soldiers. The role of First Sergeant is significant as it typically involves a senior enlisted leader who oversees a company, while the Quartermaster Sergeant provides logistics and supply management expertise vital for a unit's operations. Lastly, the Sergeant Major holds the highest NCO position and is crucial for advising commanders and mentoring junior enlisted soldiers.

Understanding this historical context highlights the importance of these ranks in shaping the current NCO structure and clearly identifies the leadership roles essential for maintaining military effectiveness and discipline.