Kammala jumla mai zuwa: Rukunin Sojoji na 163 na Montana Guard sun kasance wani ɓangare na Rukunin Sojoji na 41, wanda ya yi yaƙi a cikin Pacific a lokacin Yaƙin Duniya na II. An shigar da Regiment a cikin Rundunar Sojoji a watan Satumba na 1940, kuma an aika da shi zuwa sansanin Murray a Fort Lewis, Washington. Sun shiga cikin manyan ayyukan soja a California a 1941. A ranar 7 ga Disamba, 1941, an ba da wasu ƙananan ƙungiyoyi don tsare bakin tekun Washington daga masu lalata Japan. A watan Maris na shekara ta 1942 aka tura su Ostareliya. Yaƙe-yaƙe sun haɗa da Yaƙin Buna-Gona a cikin 1942-1943, yaƙin Salamaua-Lae a cikin 1943, Ayyuka marasa hankali da Tsanantawa da kuma
Yaƙin Biak a 1944, da kuma 'yancin Philippines a 1945. A watan Satumba na shekarar 1945 rundunar ta sauka a Hiro, Japan a matsayin wani bangare na mamaye wannan kasar. A wannan lokacin yawancin sojojin Montana na asali an sallame su.