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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.
Numbers of U.S. military service members vary by state, driven mostly by workforce levels at large bases. There were a total of 1.3 million active duty military and more than 800,000 reserve forces as of 2016, according to Defense Department data.