だい日本 にっぽん帝国 ていこく陸軍 りくぐんなら
dainipponteikokuri kugunnara

Noun
Da Copula

The "-nara" conditional form ("if/when…") of 大日本帝国陸軍

1. If/when the Imperial Japanese Army…; If the Imperial Japanese Army were to…

Nara Conditional