 If you liked
Gate: Jieitai Kanochi nite, Kaku Tatakaeri Part 2
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 ...then you might like
Nejimaki Seirei Senki: Tenkyou no Alderamin
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They both propose the same plot. Two lazy individuals who somehow get mixed up with military duties and becoming the "leader" of their squad. More than enough action in the both of them and the style of fighting typically endures warfare and tactics only the "leaders" can think of. Easily two of my favorite animes to date.