"Shell shocked soldier hiding at a fireworks show" http://i.imgur.com/DjZHl.jpg
This image + the top comment (quoted / linked below) makes you really think about what these guys / gals go through.
"I had a roommate who moved in with me shortly after leaving the hospital after his return from Afghanistan where he lost his leg. He was generally a cheerful, clear-thinking person who always seemed to be coping far better than I think I would have. That being said, he was still very much dealing with PTSD.
He spent the Fourth of July rocking himself under the dining room table, much like this woman. All I could think to do was sit and hold his hand and tell him random stories. I think I kept talking about this aquarium I loved as a kid. I don't know if he even heard me because he seemed almost catatonic. We never talked about it.
This is a very powerful image." - http://www.reddit.com/r/pics/comments/x6i9r/shell_shocked_soldier_hiding_at_a_fireworks_show/c5jpytj