I can vouch for what exscribbler says. Some years ago, in making a film for the Royal Navy, I spent some time with a NATO fleet working out of Gibraltar. At anchor at the end of each day the flotilla of boats scurrying from US and Canadian ships to RN ships was comical to behold. During a day on board the Canadian ship HMCS Kootenay (having taken a secret flask with me) I asked whether it wasn't a bore not to be able to relax over a drink after a long day. The reply was: "Ah, but we have an ice-cream plant that produces forty flavours!".