Whakaotihia te rerenga e whai ake nei: I te Mahuru 19, 1917, i whakaingoatia ano te Regiment hei 121st Field Artillery Regiment ka tohaina ki te 57th Field Artillery Brigade hei waahanga o te 32nd Division. Hei taapiri ki te 32nd Division, ko nga rekoata i whakaatu ko te 121st Field Artillery Regiment i tautoko hoki i te 3rd, 47th, 79th, a ko te regiment i wehewehe i roto i nga kaupapa nui e ono: Aisne-Marne, Alsace,
Ko Champagne, ko Lorraine, ko Meuse-Argonne, ko Oise-Aisne. I te taha o te whakamoemiti a te Tiamana o nga ope a John J. Pershing, i whakawhiwhia ki te reimana te pakanga o te French Croix-de-Guerre me te whetu hiriwa i whakairihia ki Aisne-Marne me Oise-Aisne. Ko te 121st Field Artillery Regiment i whakakorehia i Camp Grant, Illinois., Mei 17, 1919.