What rank is indicated by three chevrons and one bursting bomb?

The rank indicated by three chevrons and one bursting bomb is indeed Master Gunnery Sergeant. This rank is specific to the United States Marine Corps and represents a senior non-commissioned officer position. In the Marine Corps, three chevrons denote the Sergeant Major or below, while the addition of the bursting bomb insignia—often referred to as the "bomb"—specifies a high-level rank that includes technical expertise and leadership responsibilities.

Master Gunnery Sergeants are typically valued for their deep knowledge and proficiency in their respective areas, and their rank reflects both their experience and authority within the Marine Corps hierarchy. This distinguishes them from ranks such as Master Sergeant, which also has three chevrons but lacks the additional insignia of the bursting bomb. The other ranks mentioned are either above the scope of non-commissioned officer ranks or do not have the same insignia combination.