What year was Archibald Henderson the commandant of the Marine Corps?

Archibald Henderson served as the commandant of the Marine Corps from 1820 to 1859, making this the correct answer. His tenure is significant not only for its length—spanning nearly 39 years—but also for the profound impact he had on the development and modernization of the Marine Corps during a pivotal time in U.S. history. Under his leadership, the Marine Corps expanded significantly in size and scope, adapting to new military strategies and technologies.

During Henderson's command, he emphasized the importance of the Marine Corps in a variety of military operations, from naval engagements to ground battles. He also played a critical role in establishing the Marine Corps as a respected and vital component of the U.S. military. His influence and vision set a foundation that would shape the future of the Corps, ensuring its evolving relevance in U.S. military engagements for decades to come.