Who served as the thirteenth commandant of the Marine Corps?

John A. Lejeune is recognized as the thirteenth commandant of the Marine Corps, serving from 1920 to 1929. His tenure is significant for his efforts in modernizing the Corps and shaping its identity. Lejeune introduced various programs to improve the effectiveness of the Marines, including the establishment of the Marine Corps Schools at Quantico. He is also renowned for authoring the Marine Corps birthday message that emphasizes the tradition and honor of being a Marine, which is still recited each year.

His contributions to the Marine Corps extended beyond administrative changes; he played a critical role in developing amphibious warfare tactics that would be crucial in WWII. Additionally, his focus on leadership and training was instrumental in transforming the Corps into a more professional fighting force. This historical context highlights the lasting impact of his leadership on the Marine Corps, distinguishing his legacy from those of the other candidates listed.