I was a skydiving instructor and jump master at the time DB Cooper did his thing. The USPA made sure all of us saw the drawings and knew to speak up if his face was familiar.
On Facebook there is an old school skydiving thread where all the old timers scoff at the new assertion. DB has gone somewhere in Malaysian Air 370.
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DB Cooper was wearing loafers when he jumped out of the back of the plane on a rainy, windy night.