Which of the following is a characteristic of a Sergeant Major of the Marine Corps?

A characteristic of the Sergeant Major of the Marine Corps is indeed the emblem of the Marine Corps. This particular rank is unique among enlisted ranks, as the Sergeant Major of the Marine Corps serves as the senior enlisted advisor to the Commandant of the Marine Corps. The association with the emblem symbolizes this role, representing the heritage and values of the Marine Corps.

The emblem also stands out in the context of rank insignia because it signifies the highest enlisted position within the Corps, which holds significant responsibility in leadership and mentoring within the ranks. The emblem serves as a reminder of the Marine Corps' dedication to excellence and the embodiment of its core values, further reinforcing the prestige of the position.

The other choices reflect insignia or elements associated with different ranks or roles but do not accurately represent the distinct characteristic associated with the Sergeant Major of the Marine Corps.