Unfortunately a fact that few are willing to recognize is that if you have been homeless in the US for more than 4 weeks there is a very high (like high 90s percent) chance that you have PTSD. It’s not just the military, though us vets certainly have it as well. I’ll also wager that anyone that has spent any amount of time in our jails also has PTSD. The point I’m making is that despite the common person thinking that PTSD is just exclusive to the military, it is in fact, not.
I haven’t actually looked into it, but I would wager that globally we have better than 6 billion people walking around with some form of PTSD.