Bryan Knight was 5 years old when he said goodbye to his father at an airport in Dallas, Texas, just before he was sent off to the Vietnam War.

That was the last time he saw his father.

A few months later, US Air Force Maj. Roy A. Knight Jr., 36, went missing in action on May 19, 1967. The pilot was leading a flight of two A-1E Skyraider aircraft on a strike mission over northern Laos when his aircraft was shot down by anti-aircraft fire.