BR 81, Naval Uniform Regs state that Naval wings must be worn on Naval uniform. Regardless of the service in which the holder qualified. (Of course the Navy may not regard him as qualified.
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PMOK wears naval wings on his Rear Admiral RNR's uniform and he was a pongo. I do have a question though. The DofE's wings, when worn on a Garter Sash do look rather golden. Are they old RAF from the days of gold lace on best uniforms or RN wings?