The MP grad parade usually has graduating candidates wear the beret of their respective element before being presented the ''proper'' head-dress. As most of us know, we can get spare head-dress off clothing online, however not everyone does so. As the ''proper'' head-dress has been modified ( Red Insert for Wedge/Peak Cap ), the graduating class wears the everyday head-dress rather than DEU. Not sure how this tradition started, but I imagine it had something to do with a member not having a spare un-modified head-dress
On another note, recent CANAIRGEN states the red insert will no longer be worn with the Wedge, so back to the standard blue wedgie for Air Element MPs.