Pilot Officer Gerald BILLING was probably Flying (?) Officer G D BILLING of 401 (RCAF) Squadron, 2nd Tactical Air Force (as No.38 Group), downed by flak on 1st July 1944 with Spitfire IX ML135. He crash-landed south of Carentan in enemy territory, was seen running and finally evaded.
Source: RAF Fighter Command Losses Of Second World War by Norman L R FRANKS, Vol. 3, Midland Publishing © Norman L R FRANKS