Is Gunparade March: Arata Naru Kougunka hentai?
English title: Gunparade March: A New Song for the March
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2003 · 12 episodes · PG-13 - Teens 13 or older
Drama, Mecha, Military, Romance, Sci-Fi
It began in 1945, at the end of the Pacific War. Alien invaders filled the earth's Skies, and mankind was forced to confront an unprecedented threat. For the first time in human history, people of all cultures came together under one banner. This war has now been raging for over fifty years. Countless lives have been lost, and the Japanese military is now forced to rely on young people such as Atsushi Hayami and his high school class, also known as Unit 5121. This new generation fearlessly struggles on with the aid of the HWT humanoid combat machines and the devastating PBE bomb. (Source: Media Blasters)
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