Kammala jumla mai zuwa: 121st Field Artillery Battalion, kamar yadda aka tsara a ranar 1 ga Fabrairu, 1942, ya bambanta kansa a cikin Pacific Theater of Operations. Kyautarsa ita ce: Aitape,
Biak, Leyte, Luzon da New Guinea (tare da Saidor Arrowhead). A farkon 1943 an ba da Battalion na 121st Field Artillery Battalion 75 mm a maimakon na 155 mm howitzers waɗanda ke da makamai na yau da kullun a matsayin babban rukunin tallafi na Artillery Division.