How many members of the U.S. military are on active duty? July 8, 2020 by Pamela Landy As of 1988, 764,247 members of the U.S. military were on active duty. Related Answers Where are the following forts located? Where was the draft office where the Berrigan brothers burned draft files in 1968? Where was Fort William Henry? What military ranks did James Stewart and Clark Gable reach during World War II? What military experience did the commanders of the opposing forces at Fort Sumter have in common? What military action was known as “that splendid little war”?