The Marine's Hymn is the official hymn of the United States Marine Corps. 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 Gendarmes' Duet 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.The initial verse is "From the Halls of Montezuma to the Shores of Tripoli". The Montezuma phrase refers to the Battle of Chapultepec. The Tripoli phrase refers to actions during the First Barbary War and the Battle of Derna. In 1942 the words "on the land as on the sea" were replaced with "in the air, on land and sea". The third verse is also used as a "toast" during events important to the Corps such as the Marine Corps birthday, promotions, and retirements. Note the line "Here's health to you and to our Corps"