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Fake Navy SEALs are a dime a dozen. Read B J Burkett's Stolen Valor if you want to know how bad the problem is. There are several clear indicators of fraud in this case:
1) Heroes don't brag. Anyone who brags is not a hero. No exceptions.
2) The Medal of Honor is only received once. There is no such thing as a two Medal of Honor winner. There used to be, but the law was changed in 1917.
3) The more medals a man has, the less likely he is to talk about them.

If a man started telling me about his exploits unprompted, I would immediately accuse him of being an imposter. Ask him to grant you permission to get his records from the NPRC. Tell him you will request his DD-214 regardless. He'll most likely slink off into the darkness.