Chief Techs (with crown) were gods in the RAF techie world, especially 'V' Bomber Crew Chiefs. Unfortunately by the time I reached this exalted rank the crown had gone in favour of the four bladed prop. It was said at the time that Flt Sgts were not all all happy with sharing their coveted crown with 'upstarts' and it compromised the chain of command.
Apologies for thread drift.