In my experience as a veteran with PTSD - not really. The only difference I can tell between my PTSD and someone who has family trauma from my therapy group is veterans want to hide from it - I did for a long time. It took an immense amount of support and love from my family to finally seek out therapy, and even then I still have outbursts every now and then. They are fewer for sure but it’s something I’m going to be living with for the rest of my life.
It will take a lot of patience if you want to get involved with him, and even more support at times. I can’t speak for every veteran though we are all different and everyone’s experiences differ in ways.