Who was the first General Officer in the Marine Corps?

General Archibald Henderson holds the distinction of being the first General Officer in the Marine Corps, serving from 1820 to 1859. His leadership significantly shaped the early years of the Marine Corps, establishing standards and traditions that continue to be pivotal today. Henderson is noted for expanding the Corps' role and reputation, particularly during military campaigns, and he held the title of Commandant for an unprecedented 39 years. His contributions laid the foundation for the professionalization of the Corps, ensuring that it evolved into a critical component of U.S. military operations.

The other individuals listed, while notable in their own right, served at different times and under different contexts. They do not hold the historical significance of being the first General Officer in the Marine Corps, which is specifically attributed to Henderson.