連合れんごうこくぐん最高さいこう司令しれいかんそう司令しれいでしょう
rengō koku gun saikō shi reikan sō shire ibudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 連合国軍最高司令官総司令部

1. Supreme Commander for the Allied Powers headquarters; Probably the Supreme Commander for the Allied Powers headquarters

Polite
Presumptive
Conjecture