The Hague Convention says, that combatants have to be distinguishable externally from civilians. Otherwise,
they lose the protection given by this convention.
For warships, the United Nations Convention On The Law Of The Sea (UNCLOS) says, that they have to be commanded
by a Navy officer and have to show signs of their belonging to the armed forces, usually the flag. This point was and is
usually interpreted, as necessary only, when they are acting as warships of their country (remember the habit of commerce
raiders in WW I and II to fly the flag just seconds before opening fire) !
AFAIK, the same principles are valid for land and air forces, too and as long, as they are on their own territory, that should be
enough legitimation. And although we are speaking about all those rules in connection with mobile assets, there's a long history
of camouflaging immobile ones as civil buildings. And to call Switzerland a rogue country could have severe impact on the
financial market ! (picture of the gun emplacement from
http://de.wikipedia.org/wiki/Artilleriewerk_Jaunpass )
Quite clear, that weapons like Club-K aren't fancied by many countries, but from the legal side, I think it will be hard to get
rid of them, I'm afraid, as the concerned laws generally are international ones.
