海軍 かいぐん へい学校 がっこうなら
kaigun'e i gakkōnara

Noun
Da Copula

The "-nara" conditional form ("if/when…") of 海軍兵学校

1. If/when [it is] the Naval Academy:; If [one] attends the Naval Academy:; At the Naval Academy:

Nara Conditional