Kammala jumla mai zuwa: Rukunin Sojojin Ruwa na 5 shi ne rukunin mayakan Amurka wanda aka kunna a ranar 11 ga Nuwamba, 1943 (a hukumance an kunna shi a ranar 21 ga Janairu, 1944) a Camp Pendleton, California a lokacin Yaƙin Duniya na II. Rukunin na 5 ya ga aikin yaƙi na farko a lokacin Yaƙin Iwo Jima a 1945 inda ya sami raunin da ya fi yawa daga cikin rukunin Sojojin Ruwa uku na V Amphibious Corps (sojojin mamayewa). Rukunin na 5 ya kasance wani ɓangare na mamayewar da aka shirya na ƙasar Japan kafin
Kasar Japan ta mika wuya. Sojojin da ke kai hari na 5th Division sun kasance cikin jerin sunayen Shugaban kasa da aka ba wa V Amphibious Corps don gagarumar jaruntaka a Iwo Jima daga 19 zuwa 28 Fabrairu 1945. An dakatar da rukunin na 5 a ranar 5 ga Fabrairu, 1946.