Mezue ahịrịokwu na-esonụ: Aarnio bụ onye ọrụ afọ ofufo na ndị White Guards na Savonia Front n'oge Agha Obodo Finland. Ka oge na-aga, o sonyere na Agha Nnwere Onwe Estonia, Agha Nnwere Onwe Latvian na Agha Nnwere Onwe nke Estonia.
Njem Njem nwanne mama m mere n'Ebe Ọwụwa Anyanwụ Karelia. Aarnio si n'ọrụ agha nọ n'ọrụ banye n'òtù ndị ọrụ nchekwa na 1920. Ọ gụsịrị akwụkwọ na Kadettikoulu na 1926 na Sotakorkeakoulu na 1933. E buliri Aarnio n'ọkwa onye isi n'afọ 1929 ma jee ozi na ngalaba Mmekọrịta Ọpụpụ nke General Staff.