Whakaotihia te rerenga e whai ake nei: I a ia e mahi ana i te kamupene maitai, ka tiimata a Warren ki te haere ki te kura po i te whare wananga o Kansas City, katahi ka uru ki te ope taua i roto i te Kaupapa Whakangungu Motuhake a te Ope. 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 poto tana whakangungu hōia i muri i
I mutu te pakanga i te hekenga o Hapani. 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.