Not unlikely. My alternate hypothesis is disability compensation inflation. There is a LOT of this in the military. 100% VA disability is ~$4,000/mo (increasing every year) for the rest of your life. That is more than a typical enlisted retirement pension. And there are a handful of unfalsifiable conditions that will take you straight to 100% - PTSD (for any reason, not just combat), MST ('military sexual trauma'), and a variety of "oh my back or knees hurt, but there's nothing amiss on the MRI" type claims.
There are a lot of perfectly healthy people out there receiving 100% VA disability because they just had the inclination to play the system.
There are a lot of perfectly healthy people out there receiving 100% VA disability because they just had the inclination to play the system.