So. This was sad, I shall admit. When I got done reading it, I was disheartened. I have a friend who's planning on going into the military and I always tell him 'No! Don't die!'. I mean, there's no guarantee that he would... But still. It happens. Anyways, I really liked it. The characters felt real, even Dash. And I don't think you made any mechanical errors, so yay!
Now for the negetive(s): Personally, I'd rather song-fics not have the lyrics put out there, especially big chunks of the song. So, I pretty much just skipped over those parts and went on to the story. That's the only negetive I have... So, great job!
I am so crying right now...that was so heart breaking. But very well written it flows just fine. And that happens to be one of my fav. songs by Carrie Underwood.