A quick web search and Queens Regulations don't seem to go well together. :) Turns out to be more complex than I thought. "The CO may permit all personnel (exc

A quick web search and Queens Regulations don't seem to go well together. :) Turns out to be more complex than I thought. "The CO may permit all personnel (except Royal Marines) to request to wear full set beards. RM personnel may wear moustaches at their discretion." The moustache only ban seems to be Queen Victoria's doing. It's up to the CO if the resulting beard is good enough. Uneven growth, e.g. scrappy, is unacceptable. The advised maximum time to achieve a sufficiently thorough beard is 2 weeks. lol More here: https://www.forces.net/news/beard-royal-navy-tradition https://www.forces.net/news/beard-royal-navy-tradition As far as I know it goes back to the days of Drake. No idea if there's variations for submariners or COs. I know there are some variations of regs and traditions for the silent service.