Their performances have included halftime shows for the Kansas City Chiefs, St. Louis Rams, Indianapolis Colts, and Chicago Bears of the National Football League, as well as exhibition performances at the Bands of America Regional Championships at the Edward Jones Dome in St. Louis, Missouri and at the RCA Dome in Indianapolis, Indiana.

At the end of every show the band plays its traditional closer, "Georgia on My Mind".

That recording was made during a tribute to Dale Hopper who passed suddenly in the Fall of 2005.

The Marching Leathernecks consist of four major components: wind instruments, percussion, color guard, and danceline.

(Note: the percussion section did at one time also consist of a front "pit" ensemble as well, but was eliminated due to transportation and storage issues) Drumline: The last two major components are the color guard and danceline named Westernaires and Westernettes to keep with the WIU "Western" theme.