. >> reporter: back home, tommy mcdonald became known as d tommy, an obgny.gave all. >> reporter: this journey back to normandy was closing a chapter and with the help of his family, ensuring what happened on this coastline will be remembered for generations to come. >> it's a great honor to be able to see the people respect what was done. >> reporter: isn't that the most important thing to pass along the effort of the lesson? what your effort made? >> they understand. it's a wonderful thing for them to understand. >> he's one of the reasons we ask that you join us for tonight's special hour. we urge you to watch as a family. it's a generational lesson in bravery and modesty. return to d-day with us and with these four men who helped save the world when they were young. that is our broadcast on a friday night and for this week, thank you for being here with us. i'm brian williams reporting tonight from the u.s. military cemetery here at omaha beach. we hope to see you back home in new york on monday night. in the meantime, have a good weekend. good night from