When I was in Vietnam, the men who worked in Graves Registration were the spaciest of any Americans I saw over there. After getting out and working with veterans, the same was true.
Today Graves Registration is called Mortuary Affairs, but the job is about the same. Bodies of dead Americans come in, and the people working in Mortuary Affairs have to clean those bodies up to get them ready to ship home.
Some of the vets I have known who worked that job talked about having extra legs and arms, or maybe just a torso. Even with whole bodies, the wounds could be ghastly. I don't know how long their tours of duty were, but I do know they have a life time of memories to think about.
So, if your child decides to join up and defend America, there is a chance they will get a seven week school on how to deal with bodies and body parts, and then could be shipped off to the front. Here is a bit about the Army's units your child might get to serve with.
The 54th Quartermaster Company and 111th Quartermaster Company are the Army's only standing, permanent mortuary affairs units. Mortuary affairs training takes place at Fort Lee, Virginia and lasts about seven weeks. These soldiers search areas for hasty or unmarked graves, unburied dead, personal effects, and identification media. They also assist in preparation, preservation, and shipment of remains.
If your son or daughter happens to draw one of these units, you have a good chance of taking them to your local VA PTSD clinic for the rest of your life. Good Luck!