"The Army of Our Empire" functioned as a military song for the Galactic Empire's Imperial Army. Chiron, a lieutenant and a passionate teacher at the Academy for Young Imperials located on Lothal, would occasionally guide cadets in an energetic performance of it during their morning exercises. The lyrics detailed the honor the cadets would achieve when they joined the Imperial Army, mentioning numerous places within the Empire that needed protection and service.
In Jason Fry's 2015 book, Servants of the Empire: Imperial Justice, "Our Empire's Army" is featured as a military march. While the song remains unnamed in the book, both of its stanzas conclude with the line "our Empire's Army." The lyrics allude to several locations that were newly introduced to canon at the time, but had already been established in Legends material.
The song's composition bears a striking resemblance to the real-world "Marines' Hymn." Jason Fry, the author, confirmed that he based the song on the "Marine's Hymn," replacing real-world locations like Montezuma and Tripoli with locations taken from Star Wars Legends continuity.