At this stage of the war RAF Bomber Command only had a regular front line strength of around 400 aircraft, and were in the process of transitioning from the twin engined medium bombers of the pre-war years to the newer more effective four-engined 'heavies' such as the Handley Page Halifax and Avro Lancaster.
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He was transferred to RAF Bomber Command HQ at High Wycombe and planned the infamous Operation Millennium bombing raid on Cologne.