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How many branches are in the military of the United States? There are five branches of the US Military.   -Army   -Dept of Navy (including Marine Corps)   -Air force       The are 5 distinct branches of the Unâ¦ited States Military.
The Army is also the largest U.S. Military Service. There are approximately 76,000 officers and 401,000 enlisted members in the active duty Army. The Army is supported by two Reserve Forces which can be tapped for trained personnel and equipment during times of need: The Army Reserves, and the Army National Guard.