What a relief !!
17 it is !! I guess you knew it all along, Heartland ....
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Just to bring us back to WWII, the gold watches went to the crew of F/Lt Bob Sexton from Queensland who beat all the odds to fly 17 Berlin 'ops' through the winter of 43/44. For the record, the 'Battle of Berlin' consisted of nineteen raids in total.
And now over to Heartland, the ace mathematician....