An in-depth, behind-the-curtain look at one of the most elite fighting forces in the world. Part 1 takes us through the incredible history of the SEAL's predecessors in WWII and Korea--the underwater demolition teams that helped secure the beaches of Normandy and the Pacific--through their evolution into elite warriors, fighting in the jungles of Vietnam, the formation of SEAL Team 6, executing secret missions in Panama and Grenada, all the way up to 9-11-- the event that will change the way America fights wars.