潜水せんすいかん発射はっしゃ弾道だんどうミサイルでしょう
sensuikanhasshadandōmisairudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 潜水艦発射弾道ミサイル

1. Submarine-launched ballistic missile, likely.; Probably a submarine-launched ballistic missile.

Polite
Presumptive
Conjecture