I been trying to find info on military issued WW2 Sgian Dubhs, but there doesn't seem to be a lot of info.

I know there were military issued ones for officers and ranking NCOs, but how about most of the other troops or was it sort of a personalized item.

Black Watch Sgian Dubh
scottish-black-watch-sgian-dubh-3.jpg

Was the Sgian Dubh just for show and parades or did troops actually carry them in theater/battle and actually use them?