Rubuta ci gaba don wannan sakin layi - A ranar 19 ga Satumba, 1917, an sake sanya sunan wannan rukunin a matsayin rukunin 121 na Field Artillery kuma an sanya shi zuwa Brigade na 57 na Field Artillery a matsayin wani ɓangare na Rukunin na 32. Baya ga Rukunin na 32, bayanan sun nuna cewa Rundunar Sojoji ta 121 ta kuma tallafawa 3rd, 47th, 79th, kuma rundunar ta yi fice a cikin 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.