In 1944, Congress created the rank Fleet Admiral to be granted to four people. Rank Insignia of Navy Commissioned and Warrant Officers Navy officers wear their rank … There has … Outside this ranking system there are physicians (who may wear the same insignia in the Army/Air Force but with a slight variation in the Navy), nurses and veterinarians, while priests The Royal Danish Navy ranks follows the NATO system of ranks and insignia, as does the rest of the Danish Defence. Military personnel, level 200 … Besides the NATO-system, the Danish defence utilizes its own system, which for the navy is as follows: Military personnel, level 400 (M400): Executive level: OF-5 though OF-9. Military personnel, level 300 (M300): Operational level: OF-1 through OF-4. Comparisons are made between the different systems used by nations to categorize the hierarchy of an armed force compared to another. Links to comparison charts can be found below. This article is a list of various states' armed forces ranking designations. Several of these lists mention NATO reference codes.These are the NATO rank reference codes, used for easy comparison among NATO countries.