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If only that were correct if the man was that bad but, before they came under the Naval Discipline Act in 1977 (which by implication this was), WRNS officers and ratings were required to salute Commanders and above, and I suspect that a Group Captain would just about qualify, not least as the only Royal Air Force rank to sport a single row of scrambled egg.
I think the perceived injustice done to Wing Commanders with their bald cap peaks is rooted in the days of sail, when RN Commanders commanded vessels of the lower rates.
Not sure about Lt Cols though ............. any advice thereon?