Maybe you already know...
Maybe as a soldier myself I was manifesting my worst fears in my dreams, and witnessing some bad experiences in waking life bought it on?
Something I read once was speculating that the mind re lives certain traumas in dreams, sometimes long after they occur. They may not be exact to detail but you are dreaming so your mind has a say (this time). That your subconscious mind reacts differently to things than your waking mind. That it is "sorting out" the fears, the anxiety and sleeping phantoms in our psyche (or even our soul) while we sleep. It is during sleep that our "real self" (as it were) has another look at the "morality or insanity" of it all. In your case this was war?
I can't imagine any thing more traumatizing to our sensibilities than that. If this is what you are experiencing that is a good thing. It is a healthy sign that you are working through those memories. They may recur or not, depending if you learn the lesson they impart. You may be aware of certain questions that come up for you to answer now in the awake state. Like, what I shoulda-coulda-woulda done if...
Once you answer those then that episode might not repeat. Unless you can't face it and wake up to soon. Those nightmares are really Okay. It shows a healthy mind trying to repair its composure and self esteem?
Hope that helps.

