Originally Posted by
MAC 40612
The moniker was mainly because I wanted something aviation related but far removed from what I actually did in aviation. The actual relevance was beyond me as well. I just remember seeing it scrawled in various aviation locations I visited in the 1970s as well as on the seats of some buses/coaches but actually all is explained on this page if you scroll to the bottom.
https://c141heaven.info/dotcom/pic_64_0612.php
Fascinating!! I recall seeing the graffiti back in the 70s and 80s but being mostly in to civil / commercial aviation I never "got it".
Mystery solved after 40-odd years.