Hey, you Swiss...

Maybe someone can clear this up for me...
I was running around A.net tonight and I noticed that I couldn't realy find any swiss aircraft without a large red crossed blaze on the tail, like this: http://www.airliners.net/open.file/669953/L/
GA singles, gliders, ultralights, Airliners (to a certain extent), helos,... everything. Are swiss planes somehow required to have that on them? The ones that don't have the big blaze, at least have a little cross on the tail.

I was running around A.net tonight and I noticed that I couldn't realy find any swiss aircraft without a large red crossed blaze on the tail, like this: http://www.airliners.net/open.file/669953/L/
GA singles, gliders, ultralights, Airliners (to a certain extent), helos,... everything. Are swiss planes somehow required to have that on them? The ones that don't have the big blaze, at least have a little cross on the tail.
