Hey, the guy has gone back to the army in the US, and will take whatever punishment is coming to him. I've seen him interviewed a couple of times: he's a good man who had more stress and grief over killing than he could handle.
He certainly isn't a coward - not only did he kill when required to, but has now gone back to take his punishment. That makes him a courageous man in my books.

But I'm just waiting for the US military to throw the book at him, which would be cruel and rotten.