hard to find detailed news on him but he apparently does a lot for military people, people active duty with severe injuries, etc.
I am not aware of any of the other higher profile older billionaires (buffet, soros, gates) doing this sort of thing with a peronal interest, though foundations owned by them may do so.
Perot always has been good to our troops.
He tried hard to find out what happened to some of our missing POWs in Vietnam, and he got Chesty Puller out of retirement to help rescue some of his EDS people who had been taken hostage in the Middle East.
Perot himself barely got out on that snatch. He went personally.