連合 れんごう こく最高 さいこう司令 しれい かんであれば
rengōkokusaikōshireikandeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 連合国最高司令官

1. If/When the Supreme Commander of the Allied Forces; Were the Supreme Commander of the Allied Forces

Ba Conditional