Sigh. It seems to simple for them to put in a move to the other side of base.
Did you read the related article on cognitive restructuring? An interesting and useful approach to PTSD where you relive the experience, but use cognitive therapy to find more improved ways to deal with-it.
I'm not sure how that would work if your best friend has been shot and killed, but if it's just general gunfire, it would work. I would also think it might work for ACOAs. despite the fact so many yrs have passed.