Chain of Command Series 1 3of8 Shoulder to Shoulder

Chain of Command is an intimate portrait of the war against violent extremism, and the men and women devoting their lives to it. With unprecedented access to the U.S. Armed Forces, Chain of Command inhabits the rarely-glimpsed innermost sanctums of the Pentagon, the front lines of battlefields across the world, and even the cockpit of a fighter jet on a mission.

Part 3: Shoulder to Shoulder
American officials search for dangerous migrants in Colombia; back home, husband and wife Marines prepare for deployment to Afghanistan.