What does the military nickname “G.I.” stand for? July 28, 2020 by Pamela Landy The military nickname “G.I.” stood for Government Issue. The term was introduced during World War II. Related Answers How many Jaws movies have there been? What are the real names of these actors? How many of Bing Crosby’s sons have killed themselves? How did Legs Diamond get his nickname? Where did Butterfly McQueen get her nickname? Where did Harry Lillis Crosby get the nickname “Bing”?