Final answer:
The primary difference between the insignia of grade of Command Sergeant Major and that of a Sergeant Major is the number of chevrons and stars on the insignia. A Command Sergeant Major typically has a larger number of chevrons and stars compared to a Sergeant Major.
Step-by-step explanation:
The primary difference between the insignia of grade of Command Sergeant Major and that of a Sergeant Major is the number of chevrons and stars on the insignia. A Command Sergeant Major typically has a larger number of chevrons and stars compared to a Sergeant Major. For example, a Command Sergeant Major's insignia may have three chevrons and five stars, while a Sergeant Major's insignia may have three chevrons and three stars.
These insignia represent different levels of authority and responsibility within the military hierarchy. The higher number of chevrons and stars on the Command Sergeant Major's insignia indicates a higher rank and greater level of experience and expertise.