Operation Musk Ox was an 81-day military exercise organized by the Canadian Army in 1946. It involved the 48 members of the Army driving 11 4½-ton Canadian-designed snowmobiles ("Penguins"). They were joined by three American observers in a smaller American-made snowmobile called a "Weasel" as well as an observer from the Royal Canadian Navy and a number of scientists. The Royal Canadian Air Force provided airdrops of supplies.