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, U.S. Marines continue to work to overcome challenges while advising and assisting the Afghan National Army. Meanwhile, the Pentagon keeps focus on extremist threats around the globe. Military leaders discuss the growing concerns in Africa, deploying special operations forces uniquely equipped to handle threats there. And in Panama, a U.S. special agent joins local security forces tracking migrants for terrorist threats.