organised military forces equipped by a central authority. The utilitarian necessities of war and economic frugality are now the dominant factors in uniform design. Most military forces, however, have developed several different uniform types. Military personnel in most armed forces and some civilian officials may wear some or all of the following: combat uniform, service dress, dress uniform, full dress uniform, mess dress. Medical workers Uniforms can distinguish various categories of staff in medical institutions: doctors, surgeons, nurses, ancillary staff and volunteers. Note that traditional female nurses' uniforms resemble uniforms (habits) worn by religious orders. Equipment - notably stethoscopes - worn like a badge of office, may accompany or replace medical uniforms. Educational Uniforms are required for students in many schools in different countries. School uniforms vary from a standard issue T-shirt to rigorous requirements for many items of formal wear at private schools. School uniforms are in place in many public schools as well. Countries where mandatory school uniforms are common include Japan, South Korea, Hong Kong, Thailand, India, Australia, UAE, Singapore, Albania, Philippines, some schools in Taiwan, New Zealand, South Africa, Indonesia and the United Kingdom, among many other places. In some countries, uniform types vary from school to school, in the United Kingdom, many pupils between 11 and 16 of age wear a blazer, tie and trousers for boys and blouse, tie and trousers, skirt, or culottes for girls. The ties tend to have a set pattern or a logo embroidered representing the school, and jackets will usually carry a badge on the breast pocket with the school's name, coat of arms, and motto or emblem. Children in many British state primary schools will have a uniform jumper and/or polo shirt with the school name and logo. Some universities in the DPRK require students to wear uniforms. Diplomats From about 1800 to after the Second World War, diplomats from most countries (and often senior non-military officials generally) wore official uniforms at public occasions. Such uniforms are now retained by only a few diplomatic services, and are seldom worn. Police Members of the police in every country have a uniform for identification as law-enforcement personnel or agents. They are distinguished from the public by the uniform the police wear during overt policing activity. Usually each country has its own different police uniform. Contrast plainclothes law enforcement and undercover operations. Sports Most, if not all, sports teams also wear