Which rank corresponds to three stripes over bomb/star over four rockers?

The rank corresponding to three stripes over a bomb/star with four rockers is indeed the Master Gunnery Sergeant. In military insignia, this specific arrangement of stripes and rockers is distinctive to this rank, which reflects a high level of expertise and leadership within the ranks of the Marine Corps.

A Master Gunnery Sergeant typically holds a significant amount of technical experience and is often tasked with overseeing critical operations or mentoring junior enlisted personnel. The bomb or star symbol that distinguishes the rank indicates that the individual has achieved a level of proficiency and responsibility that goes beyond the basic leadership roles found in lower ranks.

This rank is not the same as the others listed. For instance, a Master Sergeant has a different insignia, which is characterized by three stripes above three rockers, while a Sergeant Major has additional insignia that denotes the highest enlisted rank. The distinction of the insignia, therefore, reveals not only the rank but also the responsibilities and expectations placed on that individual within the structure of military operations.