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Science | Military | Branches

Learn about the various branches of the U.S. Military. Find out how they were formed, their role in the nation's defense, and what it's like to be a soldier in one of these branches.

Quiz: Name That Military-free Country

Believe it or not, a number of countries around the world have either disarmed their militaries or never formed one in the first place. Test your knowledge of the world's nonmilitary powers.