HIGHEST NIGHT PHOTO
The highest night photograph of the war was taken on April 18, 1944, over Osnabruck. The RAF Mosquito crew used a target indicator flash and took the picture from 36, 000 feet.
( The question you want to ask during an evening in the pub to show you know everything about WW2...

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http://members.iinet.net.au/~gduncan/1944.html