Yes.
The inside-the-wire/outside-the-wire dichotomy is an artificial one. You can be outside the wire and in a fairly safe environment for your entire time, and you can be inside the wire in a position where you are seeing and doing things that human beings were never meant to see and do.
I refer to the support staff in the Role 3 Hospital. When we have casualties coming in, you may be a clerk, but you're going to be carrying stretchers. Those stretchers are pretty messy, and if you are not prepared for that, that can be quite a shock. On our rotation, we were very lucky. We had extremely good people with us, who were very quick to jump in wherever they could and who were not particularly bothered by it. But I could certainly see that being an area in which you would be particularly prone to PTSD. Medical personnel should be prepared for this. It should not be a problem for us, but our support personnel are probably exposed to more than are many people outside the wire.
Everybody does go through exactly the same decompression. To be perfectly honest, when I went through it, it wasn't listening to the lectures--because I could have taught all of that stuff, and in fact most of my corporals could have taught it--but just having a few days in a safe environment, surrounded by my army buddies, who I had just gone through a war zone with for seven months, that allowed me time to transition back to my family.