At an operational unit where there are quite a few ISAF medal holders, the hierachy will probably turn a blind eye or even be participating themselves.
Not strictly true,
members of most operational units have plenty of medals and don't seem to worried about the tacky ISAF (what is that silver thread all about) medal.
I can't see why this debate keeps arising. The rules from the beginning were that it is not to be worn on uniform. They havent changed.