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someone was looking for details on interpreting armed forces abbreviations mnbdo stood for mobile naval boom defence organization a euphemism the same as S.A.S. (which never had anything to do with the air services) It was responsible for the famous raid by canoes of the movie Cockle Shell Heroes commanded by 'blondie' hasler the unit was I believe originally based at portsmouth my father now deceased was in this unit. I have found it difficult to find any details of his service record. I do know that he served at one point in the Mediterranean, I believe Crete and also spent some time in North Africa where officially there weren't any Royal Marines at that time