Defense.net would have been an ok name (I would have said $XXX, since I don't see immediate potential) but I would have not regged défense.net.
I do own a few french dotcom and dotnet (even some dotorg), imo dotnet are not so good unless generic keyword...
For instance : enom got me concessionnaires.net ("car dealers") today, keyword is good but the .net is a drawback. However, there is a market for French dotnet domains : I have sold an average one for low €XXX a few months ago
In order to give you an idea of the current market : adulte.net ("adult" in French) has been sold for 1K a few weeks ago (it was a drop and I was in the auction).
Do you get any traffic on your French IDN domains ? Could you please PM your list (with stats), I might be interested.