Which two ranks fall under the E-8 designation in the Marine Corps?

The two ranks that fall under the E-8 designation in the Marine Corps are the Master Sergeant and the First Sergeant.

Both of these ranks share the E-8 pay grade but differ in their roles and responsibilities. The Master Sergeant typically serves in a more technical or operational role, focusing on managing and supervising personnel in their area of expertise. Conversely, the First Sergeant serves primarily in a leadership role within a company or unit, focusing on the welfare and discipline of the Marines under their command.

This distinction plays a critical role in the structure and functioning of the Marine Corps, as both ranks contribute to leadership and management but in different capacities. The understanding of these ranks is crucial for acknowledging the hierarchy and the specific duties associated with each position.

The other options do not accurately reflect the E-8 ranks, as they include ranks either not classified as E-8 or mix other ranks that do not belong to that pay grade classification in the Marine Corps structure.