Found this on Dido faceache site.The red badge was not only for tiffs. It was for (paraphrasing cus I can't remember correct wording), 'ratings not dressed as seamen'. So some medical ratings had it.
Most likely it was thought to be tiffs only as we had around 600 entrants a year compared to only a handful of 'others'
Which asks the question - why would a lreg have one? To stand out from the rest of the jrs?
( @Ballistic I know you are there! )
Shows leading dog in fore and aft rig, hence the red badge.
So when did it change? And yep, kings crown.