U.S. Secret Service: On The Front Line: In The Line of Fire

With unprecedented access, cameras go behind-the-scenes with the US Secret Service. Shift agents, intelligence agents, counter-snipers, and canine explosive ordinance units create a 360-degree shield that covers the President wherever he goes around the world. We'll be with the Advance Unit as they prep for an international Summit. With The "Shift" at a political rally and watch as preparations are made for the State of the Union address and a State Dinner at the White House. (National Geographic)