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
Assistant Commandant of the Marine Corps Assistant Commandant of the Marine Corps The Assistant Commandant of the Marine Corps (ACMC) is the second highest-ranking officer in the United States Marine Corps, and serves as a deputy for the Commandant of the Marine Corps (CMC). Before 1946, the title was known as Assistant to the Commandant. The Assistant Commandant is nominated for appointment by the President and must be confirmed via majority vote by the Senate. In the event that the Commandant is absent or is unable to perform his duties, the Assistant Commandant assumes the duties and responsibilities of the Commandant. For this reason, the Assistant