陸軍 りくぐん幼年 ようねん学校 がっこうであれば
rikugun'yōnen gakkōdeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 陸軍幼年学校

1. If it were the Imperial Japanese Army Junior School; If the Imperial Japanese Army Junior School existed

Ba Conditional