Kammala wannan jumla: A ranar 19 ga Satumba, 1917, an sake sanya wannan Rundunar a matsayin 121st Field Artillery Regiment kuma an sanya shi zuwa 57th Field Artillery Brigade a matsayin wani ɓangare na 32nd Division. Baya ga Rukunin na 32, bayanan sun nuna cewa Rundunar 'yan bindiga ta 121 ta kuma tallafawa na 3, na 47, na 79, kuma rundunar ta yi fice a manyan kamfen guda shida: Aisne-Marne, Alsace,
Champagne, Lorraine, Meuse-Argonne, da kuma Oise-Aisne. Tare da Janar na Sojojin John J. Pershing na yabo na sirri, rundunar ta karbi yakin basasa na Faransa Croix-de-Guerre tare da Silver Star da aka zana Aisne-Marne da Oise-Aisne. Rundunar 'yan bindiga ta 121 ta yi watsi da shi a sansanin Grant, Illinois, Mayu 17, 1919.