アメリカ極東 きょくとう ぐん司令 しれい であれば
amerikakyokuto ugun shire ibudeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of アメリカ極東軍司令部

1. If it were the U.S. Army Forces Far East headquarters; If the U.S. Army Forces Far East headquarters existed

Ba Conditional