Is Dominion hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 1988 · 4 episodes · PG-13 - Teens 13 or older
Comedy, Mecha, Sci-Fi
Leona Ozaki joins Newport City's infamous Tank Police division. With aid of Al and her newly built mini-tank, Bonaparte, she wages war on Buaku and his cohorts, the Puma Sisters. (Source: ANN)
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