The Marines' hymn is the official hymn of the United States Marine Corps. It is often also referred to as "The Marine Corps' Hymn". It is the oldest official song in the U.S. Armed Forces. The song has an obscure origin—the words date from the 19th century, but no one knows the author. The music is from the opera Geneviève de Brabant by Jacques Offenbach, which had its début in Paris in 1859. The Marine Corps secured a copyright on the song on August 19, 1919, but it is now in the public domain. — Excerpted from Marines' hymn on Wikipedia, the free encyclopedia.