It looks like the veterans being targeted have various concerns like PTSD, which the FAA finds that as soon as you even think you're depressed, they want to revoke your pilots license because they think you'll immediately pull Some Shit in the air.
The average person has no clue how bad mental health is in the aviation sector and how hard it has to be hidden so they can actually keep doing what they love -- to fly.
See also: https://www.cbsnews.com/colorado/news/pilots-crying-out-help...
> the FAA has subjected him to costly frequent drug tests, and doctor's visits with FAA-approved experts who don't accept insurance
> the FAA wouldn't accept other doctor's notes saying that he was perfectly fine to fly a plane
The FAA throws up some massive gates as soon as you get flagged like this and forces you to go to a battery of doctors and psychs that only they can apparently decide your fate.