Thanks Scott & Jeff,
I'm a scientist and the 'rocket' part was given to me by someone else, so it kind of stuck. I have a PhD in Chemistry but ended up for a period working for someone restoring warbirds, most of them to airworthy condition. I have worked on types such as: P-51 Mustang, Lancaster bomber, Sea Fury, T-6 Texans and Stearmans. The owner of the company was mildly amused at having a scientist work for him and rather than trying to explain it to his customers, just called me his 'rocketscientist'! Then I made the wrong career move from warbirds to chemistry (though I loved my job, I had to feed my family) and have been regretting it ever since.
But now I'm into Mustangs and that's a whole new love....
Cheers,
Brad.