Chain of Command

Chain of Command begins with a look at the efforts of U.S. and Iraqi forces to regain control of eastern Mosul — the front lines of the war on extremism.

The battle for western Mosul begins, a unit deploys for Afghanistan and the war against extremism stretches to the Caribbean island of Trinidad.

American officials search for dangerous migrants in Colombia; back home, husband and wife Marines prepare for deployment to Afghanistan.

While coalition forces in Iraq gain ground in Mosul, in Trinidad and Tobago, local Muslim leaders are the tip of the spear in the fight against ISIS.

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.

A look at the war against violent extremism in Afghanistan and Africa.

A guerra contra o terrorismo tem diferentes aspetos pelo mundo. No Campo Shorab, no Afeganistão, um grupo de fuzileiros prepara-se para regressar a casa, mas está rodeado de lembranças dos perigos que ainda assombram o país. Entretanto, em Níger, forças especiais do exército americano trabalham com as forças locais para combater o extremismo, mas a tragédia atinge-os quando quatro americanos são mortos num ataque. Enquanto se choram as mortes, a guerra contra o extremismo violento continua.