Mezue ahịrịokwu na-esonụ: The 121st Field Artillery Battalion, dị ka a kpọrọ ya na February 1, 1942, pụtara ìhè na Pacific Theatre of Operations. Ihe ndị e nyere ya bụ: Aitape,
Biak, Leyte, Luzon na New Guinea (na Saidor Arrowhead). Na mbido afọ 1943, e nyere battalion 121st Field Artillery Battalion 75 mm howitzers n'ọnọdụ nke 155 mm howitzers nke bụ ngwá agha ya nkịtị dị ka battalion nkwado izugbe nke Division Artillery.