Chain of Command

Chain of Command begins with a look at the effort to regain control of eastern Mosul, Iraq.

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 is just beginning.

U.S. Marines advise and assist the Afghan army against the Taliban, and one officer watches on Skype as his son is born back home.

Marines continue to work with local forces in Afghanistan, while the U.S. also looks to curb extremism across Africa as well as the jungles of Panama.

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

U.S. forces continue to face challenges in Afghanistan, and endure a tragedy in Niger.