Last surviving veterans of WW-II
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It's hard to imagine the increasing stress of bombing missions over such a time period.
Your father's service brought to mind another American, Billy Fiske, who pretended to be Canadian to join the RAF and so served in the Battle of Britain.
They could be scrambled into action half a dozen times a day. He flew 42 sorties in 27 days. One of the very best fliers of the honoured few who saved us, his memorial is in St Paul's cathedral.
https://www.iwm.org.uk/history/7-pilots-who-flew-in-the-battle-of-britain