The longest military conflict in U.S. history, the Vietnam War claimed the lives of more than 58,000 Americans in addition to nearly 6 million Vietnamese, Laotians and Cambodians. Featuring rare footage and exclusive interviews, Heart of Darkness is an in-depth look at a war that has left us with many unanswered questions to this day.

Part 2

1. - LBJ's War - 1966 - 1968
Examines air reconnaissance and tactics to tip the balance in the war including Operation Blackhawk, a mission designed to drive the Viet Cong from the Mekong Delta, destroy enemy encampments, capture weapons and crush defenses.

2. - Dark Days - 1968 - 1970
The Tet Offensive was a coordinated surprise attack launched on January 30, 1968 to paralyze the South Vietnam government and its army in an effort to ignite an uprising among the Vietnamese people.

3. - Was It Worth It? - 1969 - 1972
One of the most controversial battles of the Vietnam War, Hamburger Hill was a 10 day battle designed to destroy the North Vietnamese base areas in the A Shau Valley. It became a turning point for American involvement in the war as President Nixon began announcing the first troop withdrawals.