You might not have written it specifically but you eluded to it, mental instability due to wartime service.
Either way I was bummed and that can't be changed. You changed your ways though.
It is unfortunate he only received 50%, he should have been given an automatic 60% for the first leg, I think the second one would make him 100% legally According to VHA regulations and policy. He should also be receiving a few additional stipends yearly, clothing, wheelchair, and he is eligible for a grant of up to $25,000 to alter his home to suit his legless needs.
I have a few problems, the PTSD only accounts for a small 40% rating out of my total. Add up my knees, shoulders, lower back, right wrist, left ankle, that is a much higher number. Everything is added together Semi-cumulatively, actually it usually gets rounded down quite aggressively and a formula is also used to combine them. It is a bit wonky unless you sit down and use the matrix, add up all disabilities according to their official tables they use.