United States Marine Corps A decade later, in the Mexican–American War (1846–1848), the Marines made their famed assault on Chapultepec Palace in Mexico City, which would be later celebrated as the "Halls of Montezuma" in the Marines' hymn. In the 1850s, the Marines would see further service in Panama and Asia, attached to Matthew Perry's East India Squadron on its historic trip to the Far East. The Marine Corps played a small role in the Civil War (1861–1865); their most prominent task was blockade duty. As more and more states seceded from the Union, about a third of the Corps' officers left the United
Commandant of the Marine Corps over such of the members and organizations of the Marine Corps and the Navy as the Secretary determines, perform the duties prescribed for him by section 171 of this title and other provisions of law and perform such other military duties, not otherwise assigned by law, as are assigned to him by the President, the Secretary of Defense, or the Secretary of the Navy." Thirty-seven men have served as the Commandant of the Marine Corps. The first Commandant was Samuel Nicholas, who took office as a captain, though there was no office titled "Commandant" at the time, and the Second