Some 40 years ago a US Navy Lt Cdr ops guy came across to our carrier at sea for a short visit, [I forget the reason]. He was preceded by a signal telling us we were NOT to remove his mustache [sic]. The gentleman concerned was adorned with a Kaiser Wilhelm type waxed structure on his upper lip, [unlike our full set only permitted items]. It also was unusual as it was quite curved at the ends, protruded a fair distance, like a warthog, and obviously it took considerable grooming to maintain the thing. It certainly would not have survived under a P2b mask, but he was not an aviator. A fair amount of discussion was carried out in the wardroom bar at lunchtime as to a:- the uses he put it to, perhaps as an aerial aboard, or some more exotic functions ashore......, and b:- whether removing one side only would contravene the signal! It is perhaps fortunate that he stayed on board only for a day, and so survived the attentions of our fighter squadron when the evenings' bar session was in full swing!! He could not have lasted a full tour with it, that's for sure.