 Navies are generally organized into groups for a specific purpose, usually strategic, and these organizational groupings appear and disappear frequently based on the conditions and demands placed upon a navy.This contrasts with army organization where units remain static, with the same men and equipment, over long periods of time.The five-star ranks of Admiral of the Fleet and Fleet Admiral have largely been out of regular use since the 1990s, with the exception of ceremonial or honorary appointments.