Sgt. Pepper was serving with 106 Squadron. He was a crew member of Lancaster LL974 ZN-F which took off from Metheringham on a mission to Vitry. The aircraft was shot down by an enemy night fighter and all the crew died.
Royal Air Force Bomber Command Losses of the Second World War, Vol. 5, 1944 W.R. Chorley; Midland Counties Publications, 1997; ISBN 0 904597 91 1