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

TV · 2009 · 12 episodes · PG-13 - Teens 13 or older
Action, Military, Sci-Fi
The story revolves around the members of a private military company (PMC), and the uneasy tension between them and the regular military after a war that caused massive environmental destruction. (Source: Animekon)
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