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You can't go wrong to start with David Drake's 'Hammer's Slammers'. David Weber's Honor Harrington series (starts with 'On Basilisk Station') is less grim. Timothy Zahn, John Ringo, or Larry Niven's Man - Kzin stuff are all good.

Of course, much of it goes back to 'Starship Troopers', but we've already hashed that out. By the way, while it used military settings as a backdrop for RAH's opinions on civic responsibility, it wasn't about war.