Since this has turned into a general recommendations thread, this is the series I'm rereading now--
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https://www.amazon.com/gp/product/B0047Y16NU/ref=dbs_a_def_rwt_bibl_vppi_i1#customerReviewsIts really a superb series that I found by accident. I think (think being the operative word, not having experienced these things) that it has at least a somewhat accurate representation of what soldiers go through in a lot of ways, from dealing with certain situations (like the soldiers in the book were fearful of being above ground, the war being underground) to combat addiction and dealing with the civilian world after getting home, and considering the author was a CIA analyst at one point, it prolly is accurate in some ways. Thats not really the focus of the book, but its a big part of it, the focus being a big, completely fucked up war in what I think is happening in about 2100-2200. Its not sugar coated or clinical at all. The best way I can think to describe it is like taking the worst of what Vietnam was supposed to be, transporting it to the future, and putting it underground.
The other two books are just as good also, I'm rereading the third one currently.