Don my son was in Iraq as a communication specialist. They had a lot of hairy days but he is just not telling me about them after being home for three years. Don't ask questions because they can't atell a lot of things and a lot is to fresh in their minds. Let them recover and tell you when they are ready. But always be there for him.
As someone else mentioned stop reading newspapers and listening to news reports from Afganistan. They are not always 100% accurate and only cause us to worry more.
My son and I agreed when he left that we would just tell each other see you later (never goodbye). And it worked great for us. I raised my sons by myself for 12 years so we was close. They can email when they have time and other than infantry(sp) they do have time to kill.
Thank him for serving for us and he has been added to our prayer chain.