This Stratotanker is one of the newer ones. From Fiscal year 1963.
There are some 1964 ones, and they are the very 'newest' examples.
They've been rebuilt (more than once) and re-engined since the sixties but I think there's a fair chance that their sheer age might be starting to show.
IF, it was an inflight breakup- of this very sturdy design- there wont be many that are surprised.
I swa one in D-M once with 'Stone Age Mutant Ninja Tanker' nose art.
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I could understand that. (It was a 1955 model though...)