Final answer:
Major Samuel Nicholas is traditionally recognized as the first Marine Corps officer and the first Commandant of the Marine Corps, appointed in 1775.
Step-by-step explanation:
The first Marine Corps officer and "traditionally" considered the be the first Marine Commandant was Major Samuel Nicholas. He was appointed by the Continental Congress in 1775, and he led Marines during the American Revolution, setting the precedent for the Marine Corps' role in military action and leadership. He is recognized for his significant contributions to the establishment and traditions of the Marine Corps.
He helped shape the early principles and traditions of the Marine Corps that continue to this day.One of the most famous quotes attributed to Captain Samuel Nicholas is 'Semper Fidelis,' which means 'Always Faithful' and is now the motto of the Marine Corps.