What title is assigned to the military rank of E-8?

The military rank of E-8 is primarily referred to as First Sergeant in many branches of the U.S. military, such as the Army and Marine Corps. The distinctive characteristics of the First Sergeant role include not only being a senior non-commissioned officer but also fulfilling a key leadership position within a unit. First Sergeants typically have significant responsibilities in overseeing enlisted soldiers and ensuring the welfare, training, and discipline of their troops.

While the titles of Master Sergeant and Sergeant Major are also associated with the E-8 rank in different contexts, First Sergeant specifically denotes a role associated with direct leadership within a unit, uniquely identifiable by the diamond insignia worn on their uniform. This title reflects their role as a first line supervisor with direct contact and influence over the soldiers. Understanding these distinctions helps to clarify the responsibilities and hierarchy within military ranks.