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In France in 1959, a law was passed allowing you to marry a dead person.
(www.weirduniverse.net)
Thats fair.
Getting screwed out of a military pension because that military got your fiancée killed too fast just isn't fair, and you don't have to go far back in history to when the child being out of wedlock had social consequences, so provable intent being good enough is a good standard.