How many members of the U.S. military are on active duty? July 8, 2020October 15, 2011 by Pamela Landy As of 1988, 764,247 members of the U.S. military were on active duty. Related Answers What countries are members of OPEC? How many card-carrying members of the American Civil Liberties Union are there? How many members of Congress voted against the Gulf of Tonkin Resolution? How did the members of the Pre-Raphaelite Brotherhood sign their paintings? What does the military nickname “G.I.” stand for? When was the draft age of U.S. military recruits set at 18?