Which enlisted rank in the Marine Corps has an exploding bomb symbol between its rockers and chevrons?

The rank that features an exploding bomb symbol between its rockers and chevrons is the Master Sergeant. This insignia is distinctive to the Master Sergeant rank and symbolizes their role and responsibilities within the Marine Corps.

The Master Sergeant is a crucial enlisted leader who is often involved in advising junior Marines and assisting in the management and execution of operations, making the insignia a representation of their expertise and leadership. The inclusion of the bomb symbolizes the technical and combat proficiency associated with the Master Sergeant's duties, particularly in a combat arms or support role.

In contrast, other ranks such as the Sergeant Major, Master Gunnery Sergeant, and Gunnery Sergeant have different insignia and symbols that reflect their specific ranks and functions within the Marine Corps hierarchy. The Sergeant Major rank typically has a two-star insignia, while the Master Gunnery Sergeant has a grenade insignia in place of the bomb. The Gunnery Sergeant has a different insignia altogether, which does not include the bomb symbol. This differentiation in insignia helps to clearly identify the rank and role of each enlisted Marine.