Part 3, 'Shoulder to Shoulder'

S1 E3: In Chain of Command’s third episode, the scope of the war on extremism is – literally, and emotionally – on full display. While the battle for Mosul rages in Iraq, in South America, U.S. agents work with their counterparts in Colombia to prevent ISIS from making it to U.S. shores. Meanwhile, in Maine, a husband and wife prepare to leave their young children behind as they deploy for Afghanistan.