 If you liked
Ginga Eiyuu Densetsu
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 ...then you might like
Kyoukaisenjou no Horizon
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Both titles deal with sci-fi themed war stories, a huge cast of equally well-developed characters, a multilayered narration of political intrigues, country management and a rich side dish of historical references and battle of wits.
Horizon might seem more light-hearted, action-oriented and dumb at first, but it shares with LoGH the same epic (as in "full of heroism and grandeur") atmosphere, typical of this kind of tales.