後方 こうほう地域 ちいき警備 けいびじゃなかったです
kōhōchiikikeibijanakattadesu

Noun
Desu Copula

The polite, past negative form of 後方地域警備

1. Wasn't guarding the rear area.; Wasn't on rear area security.

Past/Perfective
Negative
Polite
Casual Register