No. 640 Squadron was first formed at RAF Leconfield, East Riding of Yorkshire on 7 January 1944, from 'C' Flight of No. 158 Squadron RAF. It was equipped with Halifax Mk.III bombers, and operated as part of No. 4 Group in Bomber Command. It re-equipped with Halifax VI bombers in March 1945, and was disbanded at RAF Leconfield on 7 May of that year.
First Operational Mission 5 Halifaxes bombed Berlin while 3 others aborted on the night from 20 to 21 January 1944
Last Operational Mission 18 Halifaxes bombed gun batteries on the island of Wangerooge on 25 April 1945
Listed below are further operational highlights for the following crew (see photograph right)
Bowyer, Michael J.F. and John D.R. Rawlings. Squadron Codes, 1937–56. Cambridge, UK: Patrick Stephens Ltd., 1979. ISBN 0-85059-364-6.
Delve, Ken. The Source Book of the RAF. Shrewsbury, Shropshire, UK: Airlife Publishing Ltd., 1994. ISBN 1-85310-451-5.
Flintham, Vic and Andrew Thomas. Combat Codes: A full explanation and listing of British, Commonwealth and Allied air force unit codes since 1938. Shrewsbury, Shropshire, UK: Airlife Publishing Ltd., 2003. ISBN 1-84037-281-8.
Halley, James J. The Squadrons of the Royal Air Force & Commonwealth, 1918–88. Tonbridge, Kent, UK: Air Britain (Historians) Ltd., 1988. ISBN 0-85130-164-9.
Jefford, Wing Commander C.G., MBE, BA, RAF(Retd.). RAF Squadrons, a Comprehensive Record of the Movement and Equipment of all RAF Squadrons and their Antecedents since 1912. Shrewsbury, Shropshire, UK: Airlife Publishing Ltd., 1988 (second edition 2001). ISBN 1-85310-053-6.
Moyes, Philip J.R. Bomber Squadrons of the RAF and their Aircraft. London: Macdonald and Jane's (Publishers) Ltd., 2nd edition,1976. ISBN 0-354-01027-1.
Norman, Bill. Halifax Squadron: the Wartime Bombing Operations of No. 640 Squadron, Leconfield. Preston, Lancashire: Compaid Graphics/Bill Norman Publications, 2005. ISBN 0-9547325-1-0.
Norman, Bill. No. 640 (Halifax) Squadron, RAF Leconfield: a Diary of Wartime Bombing Operations. Warrington, Compaid Graphics/Bill Norman Publications, 1999. ISBN 1-900604-08-6.