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U.S. Marines prepare to return home from Afghanistan, but they are still surrounded by reminders of the dangers haunting the country.

Chain of Command

Part 8: Why We Fight

The war against violent extremism on an aircraft carrier, and in Afghanistan and Africa.

Part 7: War Without Borders

The United States continues its global war against extremism in Afghanistan, Africa and Panama.

Part 6: Crossroads

In Afghanistan, the Marines work with local fighters as they battle the Taliban.

Part 5: Generations

As the battle of Mosul nears an end, fighting extremism in Trinidad and Tobago begins.

The End of the Beginning

The war on extremism continues across the globe -- from Iraq to Colombia to Afghanistan.

Part 3: Shoulder to Shoulder

As the war on extremism continues globally, the battle for western Mosul begins in Iraq.

Part 2: Perception and Reality

An unprecedented look deep inside the war against violent extremism.

Part 1: By, With & Through

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An intimate portrait of the war against violent extremism and the men and women devoting their lives to it. Records the fight against radical threats all over the world as it unfolds over one full year.

S1 E8 | Part 8: Why We Fight