Mary Ann Vecchio learned she had PTSD. It took over 30 years till she knew.
She was a runaway and high school dropout. Mary Ann got her diploma 20 years ago at age 46. She went on to community college to train for and then work as a respiratory therapist at a Veterans Affairs Center. That's where she realized she had PTSD.
This is Mary Ann 12 years ago:
I hope that she is happy today. She is a ray of hope for me and I hope others that went through a bad time will talk to someone and maybe get some counseling or some kind of help if they need it. This wonderful person is an inspiration as someone who remade her life much later than most of us.
I'm an old guy so I remember her picture from when she was 14:
Read more here: https://en.wikipedia.org/wiki/Mary_Ann_Vecchio
= new reply since forum marked as read
...but also very serious was something my cousin an Army vet said: "Friendly fire isn't." 
He came back a different person.
Ohio does it for me as well.
Trivia: Joe Walsh was student at Kent State at the time. He quit after that.
We have a friend with a birthday on the 11th of September. 
Two weeks after Kent State is the anniversary of the deadliest school killing, May 18th, 1927 in Bath, MI.