What rank insignia is used for a Sergeant Major (E-9) in the Marine Corps?

The rank insignia for a Sergeant Major in the Marine Corps is characterized by three chevrons, which represent the non-commissioned officer rank, and four rockers, indicating the highest enlisted rank within the E-9 category. The distinctive feature that accompanies this insignia is the five-point star, which signifies the rank of Sergeant Major specifically.

This insignia differentiates the Sergeant Major from other E-9 ranks, such as Master Gunnery Sergeant, which uses a different symbol (the bursting bomb). The combination of the chevrons, rockers, and the five-point star clearly identifies the Sergeant Major's role and status within the Marine Corps structure.