What melody from the French opera "Geneviève de Brabant" is used by Western Illinois University before all of it's football games and the United States Marine Corps as it's military hymn?
"Potpourri-Fantasie"
Title: Marines' Hymn
Passage: The "Marines' Hymn" is the official hymn of the United States Marine Corps, introduced by the first Director of USMC Band, Francesco Maria Scala.  It is the oldest official song in the United States Armed Forces.  The "Marines' Hymn" is typically sung at the position of attention as a gesture of respect.  However, the third verse is also used as a toast during formal events, such as the birthday ball and other ceremonies.  Western Illinois University uses the hymn prior to all football games.  They are the only non-military academy allowed to use the hymn.  The university has had permission to use the official nickname, mascot, and hymn of the Corps since 1927.
Title: Francesco Maria Scala
Passage: Francesco Maria Scala (1819 – 18 April 1903) also known as Francis M. Scala, was an Italian-born naturalized American military band director and musician.  He was the first and one of the most important and influential directors of United States Marine Corps (USMC) Band.  He defined the instrumental organization that the band maintains, he was an extremely prolific musician and composer, and improved and enlarged the repertoire of the ensemble.  It is thought that under his direction the USMC Band executed for the first time the melody "Potpourri-Fantasie" from the opera Geneviève de Brabant by Jacques Offenbach.  This melody is now known as the Marines' Hymn.
Title: Ray Hanson
Passage: Raymond W. "Rock" Hanson (October 5, 1895 – January 4, 1982), former United States Marine Colonel and highly decorated veteran of World War I and World War II, was best known as the football coach at Western Illinois State Teachers College (now Western Illinois University) in Macomb, Illinois from 1926 to 1941.
Marines' Hymn Francesco Maria Scala