A friend of mine was medically retired from the US Army, and a short time later he was hired under some Veteran program at the US Post Office. A few years later his medical condition affected him again -
Hydrocephalus - and he was medically retired from the post office. He collects a full pension from the military (and lifetime medical benefits), full time pension from the USPS, and is on state disability.
He hasn't worked in twenty years because he "might get a headache" but has no programs mowing his own lawn. Go figure.