 If you liked
Sengoku Jieitai 1549
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 ...then you might like
Gate: Jieitai Kanochi nite, Kaku Tatakaeri
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Both of these manga are based on exactly the same premise: what would happen in the Japanese military went back in time?
They vary in length and in character, but for anyone interested in historical manga, and alternate history in particular, both of those manga are worth recommending.