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Re:No Combat Without Movement: Enders Game as Maneuver Warfa... by e12e on Wednesday February 13, 2013 @11:50PM (#5217803)
Another sci-fi book (or series) that would be relevant in the context of tactics and strategy, is Jerry Pournelle's books/compilation on Falkenberg's Legion:

http://www.baenebooks.com/p-322-the-prince.aspx

Re:No Combat Without Movement: Enders Game as Maneuver Warfa... by angersock on Thursday February 14, 2013 @12:52AM (#5217966)
Less good for strategy but more for simply being excellent military sci-fi, I'd recommend David Drake's Slammers series and Joe Haldeman's Forever War.