On Wings (sorry BEags - "The Flying Badge") not beards.
I once had to research the rules on Wings on Uniforms for a specific case - this was about 15-20 years ago so I don't know if still true.
Can't remember the reference either - maybe P1 ceremonial? - but I do recall the answer was as follows:
Army and RAF Wings only may be worn on RAF or Army uniforms. RN Wings may be worn on neither.
RN Wings may be worn on RN or RM uniforms only. Army Wings may be worn on RM uniforms.
Never did get the answer about RAF wings on RM ............
So Harry Sussex's wings are kosher - not so sure about the face fungus though.