How long did Brigadier General Archibald Henderson serve as Commandant?

Brigadier General Archibald Henderson served as the Commandant of the Marine Corps for an impressive 39 years, from 1820 to 1859. His tenure is notable for being the longest in the history of the Marine Corps. During this period, Henderson greatly influenced the development of the Marine Corps, promoting a philosophy of aggressive tactics and leadership that has had a lasting impact on the organization. He also oversaw a significant expansion and modernization of the Corps, ensuring that it was well-prepared for its evolving role in the military landscape of the time. This extensive duration of service not only highlights his dedication but also illustrates the pivotal changes in the Marine Corps during the 19th century under his leadership.