You rang Gabby?
Your friend has a right to be bitter. Although after this many years I would wonder why the chip on his shoulder is still raw. A lot of vets from that era got shit upon. In 91-92 when we had parades, it opened some wounds. I would surmise that today the situation is similar.
Funny thing is that all folks are different. For example, the only outward change I am aware of is a tendency to react quick, fast, and in a hurry to sudden acts. And, of course, I am compulsive about securing the space where my family sleeps. Weapons nearby in case of intrusion. Things like that. I'm actually gratefull that I am not all that deranged or injured.
As time goes on and the number of people I know who've died increase... I feel a bit guilty for retireing after my unit got back.
Best thing to do for your friend is let him talk when he will and don't judge him.
Edited to add: I think CSM is on that list also.
I'm Phil -- 40 something heterosexual white male, fairly self sufficient, great with my kids, wed 29 years to the same woman, and I firmly believe that ones actions have logical consequences. How much more out the box can you get nowadays? -- MSgt of Marines (ret)