In the Army Song, what is highlighted as a source of pride?

The correct answer highlights "all that has been done by the Army" as a source of pride. This encompasses not only the battles fought and won but also the sacrifices made by service members and the advances in technology. The Army Song serves as a tribute to the collective achievements and history of the Army, celebrating its enduring legacy and contributions to the nation. This broader perspective reflects the spirit and identity of the Army, illustrating that pride is derived from a comprehensive view of its operations, history, and mission, rather than focusing on any single aspect.