Sergeant William Edward Callaghan was the son of Edward and Evelyn Callaghan, of Portadown, Co. Armagh. He was a member of Ballindrum Pipe Band, Moneymore.
William Callaghan was serving with the R.A.F, Coastal Command as a member of the aircrew onboard a Hudson II (T9373). During a night patrol on 27th December 1940, the aircraft ran out of fuel. The crew abandoned and the Hudson crashed. Sergeant William Callaghan was thought to have been lost at sea.