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
Sergeant Major of the Marine Corps Marine Corps and typically serves a four-year term, though his service is at the discretion of the Commandant. Since Sergeant Major Wilbur Bestwick was appointed the first Sergeant Major of the Marine Corps in 1957, 17 different Marines have filled this post. On January 20, 2015, Commandant Joseph F. Dunford, Jr. announced that Sergeant Major Ronald L. Green would relieve Sergeant Major Micheal P. Barrett and serve as the 18th Sergeant Major of the Marine Corps on February 20, 2015. Sergeant Major of the Marine Corps Sergeant Major of the Marine Corps (officially abbreviated to SMMC<ref name="ALMAR 016/09"></ref>) is a