Who was the fifth commandant of the Marine Corps?

The fifth commandant of the Marine Corps was Archibald Henderson. He served from 1820 to 1859 and is often referred to as the "grand old man of the Marine Corps" due to his lengthy tenure and significant contributions to the service. His leadership was marked by modernization efforts and the expansion of the Corps during a time of growth and change. He played a pivotal role in establishing the organization and reputation of the Marine Corps as a vital component of the United States military.

Under Henderson's command, the Marine Corps became more professional and structured, and he emphasized the importance of training and discipline, which laid the groundwork for future developments in the Corps. This period also saw the Marine Corps becoming involved in several key military engagements, further solidifying its role in the U.S. military.