How long did Archibald Henderson serve in the Marine Corps?

Archibald Henderson served in the Marine Corps for an impressive 56 years, making him one of the longest-serving officers in U.S. military history. His tenure began in 1806 and continued until his death in 1868. During this time, Henderson played a significant role in expanding the Marine Corps and is often referred to as the "Grand Old Man of the Marine Corps" due to his long service and leadership. His time in the Corps was marked by several key contributions, particularly in shaping the modern organization and operational capabilities of the Marines during a formative period in U.S. military history. This long service helped establish many traditions and operational standards still recognized today, solidifying his legacy within the Marine Corps.