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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.
1 Army â As the oldest branch of the Military, the Army protects the security of the United States and its resources. 2  Marine Corps â Working closely with the Navy, the Marine Corps is often first on the ground in combat situations.