Well, you're supposed to get the lifelong disability by claiming PTSD, Tinnitus, Migraine. That's why disability has skyrocketed recently. Social media has allowed spreading the game plan pretty widely and most veterans know how to get as close to 100% disability as possible. There are entire channels dedicated to gaming this.

There are lots of healthy people out there claiming this (though obviously there are lots of people who do actually have the conditions as well).