A pretty typical VA issue.
My dad was drafted, went to Vietnam, and many years later developed ALS - somewhat recently added to the "Always covered for vets" list, as being a veteran in any war doubles the risk of ALS.
The battle to prove it was ALS though was insane, had to be done outside of the VA with specialists (it is still rare, of course, so not many out there can actually give a diagnosis), and took about a year from blatant symptoms to diagnosis, and then another few months of VA paperwork to get coverage and other things he was owed.
Not a new problem unfortunately, and certainly not unique to this situation. Just another kind of symptom of another kind of problem.
Layers make keyboard go brrrrr