This hour, we’ll listen to Marty’s conversation about Ken Burns and Lynn Novick’s much anticipated 10 part PBS documentary about the Vietnam War. Marty spoke with four guests at the Museum of the American Revolution last week about what it was like to serve in Vietnam, and about how the experience changed them. Veteran RALPH GALATI, was shot down and imprisoned at the infamous “Hanoi Hilton” alongside John McCain. ERTELL WHIGHAM  Marine Corps veteran served in Vietnam in 1969, and MARSHA FOUR worked as a nurse in Vietnam in 1969. We’ll also hear from psychologist PETER YEOMANS, who works at the Philadelphia VA Medical Center and studies PTSD and something called “moral injury.”