Part 8, 'Why We Fight'

S1, E8: The war on terror looks different across the world. At Camp Shorab in Afghanistan, a group of Marines prepare to return home, but are surrounded by reminders of the dangers still haunting the country. Meanwhile in Niger, U.S. Army Special Forces work with local forces to combat extremism, but tragedy strikes when four Americans are killed in an attack. As the losses are mourned, the war against violent extremism continues.