Decent military sci-fi with the emphasis on military. The same story could have been set in a British colonial war, the French colonies in North Africa, U.S. Wars in Vietnam, Korea, Afghanistan or the various American Indian wars. Real soldiers, their actions and reactions, their loyalty to each other, do not really change with advances in technology.
Just for fun, here's a quote from another review on a forum other than Amazon, "Tense...and Xenophobic, Racist, Classist, Sexist and Jingoistic." He didn't like it. Doesn't seem to like the real world much either. If you don't understand that in most wars, most soldiers dehumanize their opponents because it makes killing them more palatable, not palatable but more palatable, then you should avoid this book like the plague. Stick to politically correct pap.
I do agree somewhat with the complaints about a weak ending. On the other hand, it could be regarded as a thoughtful ending. Nothing ever really changes.