Ciao Elipix! Great to see you back on the thread.
I am not sure how relevant this is but .. the French Air Force operated an electronic warfare squadron known as Armée de l'Air SARIGUE-NG standing for Systeme de Recueil d'Informations de Guerre Electronique (Airborne Electronic Warfare Information Gathering System) and the NG standing for
'nouvelle generation' (or new generation) which they added when they re-launched themselves in the 1990's (IIRC). Anyway, their symbol was a possum or 'tree kangaroo' (see patch below).
If is was not associated with this squadron (which I suspect) then it will be something altogether different.
Hopefully someone else may have further revelations. Perhaps if Zishelix is back from his holidays he might be able to assist!