ROYAL AIR FORCE BOMBER COMMAND, 1939-1941. - The Rolls Royce Merlin engines of an Armstrong Whitworth Whitley Mark IV or V, of No. 10 Operational Training Unit, are run up prior to take off at Abingdon, Berkshire. , Royal Air Force, Advanced Flying Unit, 10 (Observers), Dumfries

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Photo credit: © piemags/ww2archive / Alamy / Afripics
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