Chain of Command

An unprecedented look deep inside the war against violent extremism.

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

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

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

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

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