I am currently reading Matterhorn: A Novel of the Vietnam War, by Karl Malantes. I am about halfway through it and it is a very good read. There are a lot of characters at first and it is sometimes hard to keep them straight, but as the story goes on it gets easier. It is quite gripping at times and as I read before I go to bed, sometimes I find myself staying up too late, being engrossed in what is happening.
So far I would recommend it as a great war story, and has been compared to Mailer's The Quick and the Dead, which I am a big fan of.