Part 1, 'By, With & Through'

S1 E1: The chain of command of the U.S. armed forces in the war on violent extremism stretches around the globe, with service members on the front lines in eastern Mosul, Iraq; on bases in the Persian Gulf, monitoring Middle East airspace; and back in Washington, D.C., overseeing the entire effort. In the premiere of Chain of Command, we get exclusive, striking glimpses of how the war of our generation is being waged — and how it might be won.