Hi Jacques,
I think the Overseas and Commemorative (ex Yougoslavie) etc fall in a different category, they would have parallels in the British or US system of Campaign Medal. I dont think that is what Hugh is on about.
I think what Hugh is talking about are medals for non operational deployment, then a bronze one for 30 days at sea, and a silver one for 50 days at sea, and a good cunduct for not being late for a year and a happy face medal for not pssing your commander off, then a "my wifes gonna kill me" medal for being posted to Luxembourgfor 6 months etc. etc. In France this will all be covered by a Defense National.... but some other countries may have a seperate medal for each of the items listed ;-).
Best
Chris