(I) The abbreviation GI in official U.S. Army usage means government issue or general issue. (II) Thus officially , it denotes supplies which are issued by the quartermaster service. (II) However, it was adap¬ted as slang, and subsequently applied to any servi¬ce custom or regulation, such as 'GI haircut.' (IV) The classic GI haircut is the short back and sides cut known as a 'crew-cut', which became fashionable for men in the fifties. (V) In World War II, by extension, it came to mean any enlisted service man or woman.