Which marine Corps figure was known for their service during the early 19th century?

The figure known for their significant service during the early 19th century is Archibald Henderson. He served as the 5th Commandant of the Marine Corps from 1820 to 1859, a length of time that was unprecedented for the position. Henderson is often recognized for transforming the Marine Corps into a more professional military organization and expanding its role and capabilities. During his tenure, he emphasized the importance of education, training, and discipline among Marines, which laid the foundation for modern practices within the Corps. This period saw the Marine Corps develop a distinct identity, moving beyond its origins as a small force for shipboard security to becoming a more versatile and capable branch of the U.S. military.

The other individuals listed either served at different times or were not as prominently recognized during that early 19th-century period. Capt Robert Mullen and Capt Samuel Nicholas served earlier than the 19th century, while Alfred A. Cunningham, known as a pioneer aviator in the Marine Corps, was active much later in the early 20th century.