Brace your ears: You're about to hear Devil Dogs in all keys singing about the halls of Montezuma and the shores of Tripoli the next time the "Marines' Hymn" is played in public. The commandant of the Marine Corps reportedly wants to hear more leathernecks proudly belting out the lyrics to their hymn. That's according to a March 29 report from Marine Corps Times about upcoming changes to the service's drills and ceremonies manual, which will include a new directive about the beloved and highly recognized hymn. Read more about the change on Military.com.