Rubuta ci gaba ga wannan sakin layi - Rundunar Sojoji ta 15 ta bar kasar Sin zuwa Fort Lewis, Washington, a ranar 2 ga Maris, 1938. A ranar 12 ga Janairu, 1940, an sanya rundunar zuwa Rukunin Sojoji na 3. LTC Dwight D. Eisenhower ya yi aiki a cikin 15th daga Maris zuwa Nuwamba 1940, a matsayin kwamandan na 1st Battalion. A ranar 24 ga Oktoba, 1942, 15th Infantry da 3rd Infantry Division sun tashi daga Norfolk, Virginia, zuwa Faransa ta Morocco. A cikin watanni 31 masu zuwa, rundunar ta yi yaƙi ta Arewacin Afirka ta Faransa, Sicily, Italiya, Faransa, da Jamus. A ranar 10 ga Yuli 15th Infantry ya fara a Sicily a Licata a h.2.57, mamayewar Allied na Sicily
, wanda ake kira Operation Husky, a bakin rairayin bakin teku na Mollarella da Poliscia. A ƙarshen yakin a Turai, Rundunar Sojoji ta 15 tana da masu karɓar lambar yabo ta 16 ciki har da Audie Murphy, soja mai fama da yaƙi na Yaƙin Duniya na II. Rashin rayuka na 15th na yakin duniya na biyu sun hada da, 1,633 da aka kashe, 5,812 da suka ji rauni, da 419 da suka rasa a cikin aikin.