
Modern Era, United States, Infantry
The 121st Infantry Regiment belongs to the Army's preserved modern regimental lineage structure. It represents the continuity of identity, honors, and organization across repeated force-structure changes in the twentieth century.
Its history is maintained mainly through official lineage rather than through one continuous regimental field career, a pattern common among many higher-numbered infantry lineages.
The 121st Infantry remains part of the Army's broader institutional memory and historical record.
A dedicated battalion subpage now collects the regiment's known battalion icons and short battalion sketches for the 1st, 2d, and 3d Battalions. Open the 121st Infantry Regiment Battalions page.