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
Military Secretary to the Commandant of the Marine Corps of the Commandant, and performs other duties as the Commandant may direct. In order to perform the multi-faceted duties of the Military Secretary, the Marine must be well versed in all aspects of the United States Marine Corps, the United States Department of Defense, and the United States Government. Comparable positions in other branches of the military are: The Military Secretary serves as a direct advisor to the Commandant of the Marine Corps. The Military Secretary is primarily responsible for filtering and directing the flow of information to the Commandant, keeping the Commandant abreast of situations impacting the Marine Corps,