I can't be sure, of course, since I only know about the people I met at the medical assessment and on the Facebook group, but I have a feeling most of the candidates are Flemish.
Of the 6-7 attendees on the day I had my medical check, only 2 were French-speaking (1 or 2 of the total group were part of the reserve list.) This may of course not be the division as it is in the actual group.