How long did Archibald Henderson serve as Commandant?

Archibald Henderson served as the Commandant of the Marine Corps for an impressive 38 years, from 1820 to 1859. This remarkable tenure is noted for establishing a standard of leadership and organization within the Marine Corps that significantly shaped its future. Henderson's leadership during this period included the expansion of the Marine Corps and the development of its roles in military operations. He is often referred to as the "Grand Old Man of the Marine Corps" for his enduring influence and contribution to the service. The lengthy duration of his command reflects both his ability to adapt to changing military needs and the trust placed in him to lead during a transformative time in U.S. military history.