I don’t get the idea that the USMC presumes ownership of a person’s eternal life. Only God has those rights.
Forgive me, but your statement doesn't make any sense at all. What did Don-o's post have to do with "ownership of eternal life"?
I suspect that you don't really understand what he was talking about and I further suspect that you haven't ever been nearer to the Marine Corps than seeing a couple of bumper stickers. Just a guess, mind you.