I"MHO, the most useful piece of headgear for aircrew. SD Caps get 'Trashed' in FJ cockpits. Leading to the 'Combat' caps, which used to upset the 'B' word! (Mind you, that makes it worthwhile, on it's own!)"
Which is why it was reintroduced in the early '70s.
MInd you, if I'd known that The Scottish Officer didn't like them, I might have bought one on the off chance I might bump into the d*ckhead.