with 8 episodes premiered on January 15, 2018

Filmed over 18 months, the series features incredible access from inside the walls of the Pentagon to the front lines of the U.S. military's mission to fight global extremism around the globe. The gl… see more

with 1 episodes premiered on Invalid Date

For every agent in the United States Secret Service, the most high-profile security assignment is to protect the president of the United States. In National Geographic's documentary series Chain of C… see more