Just ask lots of leading questions. People like this always show themselves up without needing any further help from one in the know. Ask him what exactly he did, then do a bit of research, then ask him some more.
The 2 GSM's give the game away straight off the bat. The GSM has clasps awarded for further and / or other tours, it's never awarded twice.
By the way, is this the first time a "Walt" has been mentioned on PPRuNe? It's normally a favourite subject of those wags on "ARRSe"!
