Sgt Roy Penry Williams, from Glamorgan, was a radio operator on board Wellington bomber R1397.
The bomber was part of 103 Squadron when it took off from RAF Elsham Wolds in Lincolnshire in July 1941.
Its mission was to bomb the German town of Emden but Sgt Williams and the other five crew members were killed when the aircraft was shot down by enemy fire near Boznum in the Netherlands.
Research by the Joint Casualty and Compassionate Centre (JCCC) has now confirmed all six airmen are buried in a communal grave at Leeuwarden Cemetery, Netherlands.
A re-dedication ceremony of two new headstones bearing the names of the crew is now planned for September 15, 2015. Sgt Williams's family are invited to attend.
Sgt Williams's last known address was in Bridgend, Glamorgan and it is also known that his family have lived previously in the Llanllyfni area of Gwynedd.
The service in September marks the end of a great deal of analysis by the JCCC team who have been working closely with the Royal Netherlands Army. After 74 years, we would love to be able to trace Sgt Williams's family so an inscription can be included on the headstone and so they have the opportunity to attend the service.