Forty years ago, soldiers returning from Vietnam were advised to change into civilian clothes on their flights home so that they wouldn’t be accosted by angry protesters at the airport. For a Vietnamese businessman who helped the U.S. government, a rising sense of panic set in as the last combat troops left the country on March 29, 1973 and he began to contemplate what he’d do next. A young North Vietnamese soldier who heard about the withdrawal felt emboldened to continue his push on the battlefields of southern Vietnam.

While the fall of Saigon two years later — with its indelible images of frantic helicopter evacuations — is remembered as the final day of the Vietnam War, Friday marks an anniversary that holds greater meaning for many who fought, protested or otherwise lived the war. Since then, they’ve embarked on careers, raised families and in many cases counseled a younger generation emerging from two other faraway wars.