“The Vietnam War” begins with Henry Kissinger’s call to put Vietnam behind us. It ends with the Beatles’ “Let It Be.” Ken Burns and Lynn Novick explain the difference, and how the painful lessons of the Vietnam era can help us today.

Some soldiers in Vietnam fought bravely, and then came home to oppose the war they’d served in. Their experiences are a reminder that Vietnam mixed up American notions of patriotism. As Ken and Lynn explain, we’re still trying to piece it back together.