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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 branch of the military. Along with active duty soldiers, the Army also has two reserve components-the Army Reserves and the Army National Guard.he Marines are the second smallest branch of the military. Their purpose has changed somewhat over the years. When it was first established in 1775, it was under the Navy as a ground force element of the branch.