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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.

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The United States Navy is the largest navy in the world. Learn how the Navy is structured, what ships it uses, what life is like in the Navy and how it has evolved over the years. See more »

Articles 1-13 of 13

How Area 51 Works

Less than 100 miles from Las Vegas, Nev., is the most famous secret military installation on the planet. Rumors swirl around this base, much like the mysterious aircraft that twist and turn in the skies overhead.

How Delta Force Works

Delta Force is the U.S. military's most elite tactical combat group. Yet the government refuses to deny its existence. Does a well-funded secret force that, allegedly, answers only to the president make the U.S. more secure or more vulnerable?

How IARPA Works

Described by government officials as "disruptive," this research and technology organization is supposed to change the face of U.S. spying. Is IARPA a real-life James Bond Q Branch?

How is the National Guard different from the regular Army?

The National Guard serves many purposes and does many jobs for the United States. Learn what the National Guard is and how it differs from the Army and the Air Force.

How NORAD Works

Ever heard of a military operation run out of a hollowed-out mountain? Welcome to NORAD, a defense command that monitors air and space for potential attacks on the U.S. Learn about NORAD and the unique location for the NORAD headquarters.

How the Army Rangers Work

The U.S. Army Rangers are an oddity of the U.S. military special operations forces. Though they can trace their lineage as far back as colonial times, they didn't become a permanent presence in the military until the 1970s.

How the Green Berets Work

John F. Kennedy called the green beret "a symbol of excellence, a badge of courage, a mark of distinction in the fight for freedom" -- a nod to the most formidable arm of the U.S. military. The Green Berets, or Special Forces, are America's first line of defense around the world.

How the Navy SEALs Work

For most of us, “Special Ops” is what we see in the movies: soldiers trained to kill using their thumb; Charlie Sheen carrying a semi-automatic. But Special Operations are for real, and the U.S. Navy version -- the SEALs -– complete some of the most dangerous military missions. Learn about the Navy SEALs.

How the U.S. Air Force Works

The U.S. Air Force is the youngest American military branch, forming in the 20th century after the invention of the airplane. Tasked with protecting the nation's skies and supporting ground troops, the Air Force relies on the most technologically advanced military aircraft in the world.