Colin served in the Royal Air Force Volunteer Reserve as a Sergeant (Navigator) with 463 (RAAF) Squadron.  Colin died on 19th July 1944.  He is buried in TERLINCTHUN BRITISH CEMETERY, WIMILLE, France.

A search of the CWGC records bring up one return for Colin Hymas and it is believed that this is the man named on the war memorial.

463 Squadron of the Royal Australian Air Force were based at Waddington and flew Lancaster bombers, it was common for British crews to serve in the Australian squadrons.

Colin and his fellow crew flew a Lancaster DV374 JO-B.  Taking off from Waddington at 22:55hrs on 19th July, they were tasked with destroying a railway junction at Revingny, France.  On failing to return it was later established that DV374 JO-B had been shot down by a night fighter close to the village of Droupt-Ste-Marie.

Originally buried in the churchyard of Droupt-Ste-Marie the crew were exhumed in March 1983 and reburied in the CWGC cemetery at Wimille.  Following the removal of the graves an obelisk was erected in Droupt-Ste-Marie to remember the crew and that of a crew from 467 Squadron who were also originally buried in the churchyard.