Tuhia tētahi tohutoro mō tēnei wāhanga - I a ia e mahi ana i te kamupene maitai, ka tīmata a Warren ki te haere ki te kura pō i tētahi kōleji rangatahi i Kansas City, kātahi ka uru atu ki te hōia i roto i te Army Specialized Training Program. I a ia e whakangungu ana i te ope taua, i uru ia ki tetahi kaupapa hangarau tere i te Whare Wananga o Kansas State. Whai muri i tana mahi pai i reira, i whakaaetia ia ki tetahi kaupapa whakangungu hoia i roto i te reo Hapanihi me nga rangahau rohe e whakahaerehia ana i te Whare Wananga o Yale. I whakaotihia e ia taua hōtaka i muri tata mai i tana huritau 18, i muri i tana noho e wha hauwhā i Yale. I te 18 o ona tau i te raumati o te tau 1945, ka tiimata tana whakangungu taketake i Camp Roberts i California. I whakarerea tana whakangungu hōia i muri i te hekenga o Hapani
ka mutu te pakanga. I tonoa ia e te Ope Taua ki te Whare Wananga o Minnesota ki te haere tonu i ana akoranga mo Japan me tona reo. I muri i nga marama e toru i Minnesota, i tukuna ia ki Japan, i reira i noho ai ia i te tau whakamutunga o tana mahi hoia a te US.