Rubuta ci gaba don wannan sakin layi - Rukunin farko na jihohi da za a tura don mayar da martani ga harin da aka kai wa Pearl Harbor, Rukunin na 27 ya bar Fort McClellan 14 ga Disamba 1941 zuwa California don kafa wuraren toshewa game da mamayewar ruwan teku da ake tsammani a kudu maso yammacin Amurka. An sake tura su zuwa Pacific Theater of Operations kuma suka isa Hawaii, 21 ga Mayu, 1942, don kare tsibirin tsibirin daga hare-haren amphibious. Sojojin Sojoji na 165 da na 3, 105th Infantry sun fara aiki a kan abokan gaba yayin kai hari da kama Makin Atoll a Gilbert Islands, 21-24 Nuwamba 1943. Runduna na 1 da na 3 na 106th sun shiga cikin harin kan Eniwetok Atoll
, 19<unk>26 Fabrairu 1944, dawowa zuwa Oahu a watan Maris. A yayin wannan aikin, Bataliya ta 2, 106th Infantry ta sauka ba tare da hamayya ba a tsibirin Majuro, 1 ga Fabrairu, kuma ta kammala kwace ta, 3 ga Fabrairu. Ƙungiyar ta fara shirye-shirye don ayyukan Marianas, 15 Maris. A ranar D-da 1, 16 ga Yuni, 1944, abubuwa sun sauka da dare a Saipan don tallafawa na biyu da na huɗu na Marine. An kafa tashar jiragen ruwa kuma an kama Aslito Airfield, Yuni 18. Yaƙe-yaƙe ya ci gaba a watan Yuni. Janar Holland Smith, wanda bai gamsu da aikin Rukunin na 27 ba, ya sauƙaƙe kwamandansa, Janar Janar Ralph C. Smith., wanda ya haifar da fushin fushi daga manyan kwamandojin Sojoji, ciki har da Shugaban Sojoji George C. Marshall. A lokacin yakin basasa, 7 ga Yuli, Jafananci sun mamaye abubuwan da ke cikin rukunin a cikin harin banzai, amma an murƙushe juriya da aka shirya a rana mai zuwa. A cikin watan Yuli da Agusta, rundunar ta 27 ta tsabtace wuraren da ba kowa a cikin duwatsu da kuma tsaunuka na Saipan.