Is Strike Witches: Operation Victory Arrow hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2014 · 3 episodes · R+ - Mild Nudity
Action, Ecchi, Military, Sci-Fi
Operation Victory Arrow is set in the period between the end of Operation Mars in the second television series and the 2012 Strike Witches movie. The three 30-minute short stories depict the lives of the members who returned to their respective homes. (Source: ANN)
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