Final answer:
The rank of Sergeant Major, the highest noncommissioned officer rank, was established in the year 1775, coinciding with the creation of the Continental Army.
Step-by-step explanation:
The rank of Sergeant Major was established in the year 1775. As the highest noncommissioned officer rank in military units, the role of a Sergeant Major has been crucial to the function and structure of military hierarchies. Throughout history, this role has evolved, but it was formally recognized in its inception during the creation of the Continental Army. They are the senior enlisted advisors to the commanding officer and play a key role in maintaining discipline and standards within military ranks.