The Tarte of the Gendarmerie Nationale

It took me by surprise, watching a video of the 14th July celebrations, to see that not only the Chasseurs Alpins wear the tarte, but also the members of the specialised Mountain Units of the Gendarmerie Nationale. 

The unit is named Peloton Gendarmerie (Haute) Montange, or PG(H)M. 

Apart from the link to the French Wikipedia (above), I haven't found much about tartes in the Gendarmerie Nationale. If any reader has more information, I'd love to hear!